annotate xml/dnsbl.in @ 471:419564449cea stable-6-0-77

change paths from /var/run/dnsbl to /run/dnsbl
author Carl Byington <carl@five-ten-sg.com>
date Wed, 16 Dec 2020 13:34:55 -0800
parents f3f1ece619ba
children
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1 <reference>
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2 <title>@PACKAGE@ Sendmail milter - Version @VERSION@</title>
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3 <partintro>
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4 <title>Packages</title>
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5
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6 <para>
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7 The various source and binary packages are available at <ulink
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8 url="http://www.five-ten-sg.com/@PACKAGE@/packages/">http://www.five-ten-sg.com/@PACKAGE@/packages/</ulink>.
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9 The most recent documentation is available at <ulink
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10 url="http://www.five-ten-sg.com/@PACKAGE@/">http://www.five-ten-sg.com/@PACKAGE@/</ulink>.
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11 </para>
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12
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13 <para>
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14 A <ulink
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15 url="http://www.selenic.com/mercurial/wiki/">Mercurial</ulink> source
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16 code repository for this project is available at <ulink
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17 url="http://hg.five-ten-sg.com/@PACKAGE@/">http://hg.five-ten-sg.com/@PACKAGE@/</ulink>.
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18 </para>
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19
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20 <para>
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21 Bitcoin donations for this project may be sent to
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22 <ulink url="bitcoin:17n5xJZ9a8csJW2uLeZn7i6jegNKGdLUPJ">bitcoin:17n5xJZ9a8csJW2uLeZn7i6jegNKGdLUPJ</ulink>
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23 </para>
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24 </partintro>
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25
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26 <refentry id="@PACKAGE@.1">
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27 <refentryinfo>
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28 <date>2019-03-09</date>
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29 <author>
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30 <firstname>Carl</firstname>
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31 <surname>Byington</surname>
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32 <affiliation><orgname>510 Software Group</orgname></affiliation>
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33 <personblurb><para></para></personblurb>
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34 </author>
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35 </refentryinfo>
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36
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37 <refmeta>
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38 <refentrytitle>@PACKAGE@</refentrytitle>
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39 <manvolnum>1</manvolnum>
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40 <refmiscinfo>@PACKAGE@ @VERSION@</refmiscinfo>
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41 </refmeta>
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42
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43 <refnamediv id='name.1'>
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44 <refname>@PACKAGE@</refname>
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45 <refpurpose>a sendmail milter with per-user dnsbl filtering</refpurpose>
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46 </refnamediv>
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47
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48 <refsynopsisdiv id='synopsis.1'>
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49 <title>Synopsis</title>
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50 <cmdsynopsis>
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51 <command>@PACKAGE@</command>
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52 <arg><option>-c</option></arg>
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53 <arg><option>-s</option></arg>
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54 <arg><option>-d <replaceable class="parameter">n</replaceable></option></arg>
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55 <arg><option>-e <replaceable class="parameter">from|to</replaceable></option></arg>
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56 <arg><option>-b <replaceable class="parameter">local-domain-socket</replaceable></option></arg>
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57 <arg><option>-r <replaceable class="parameter">local-domain-socket</replaceable></option></arg>
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58 <arg><option>-p <replaceable class="parameter">sendmail-socket</replaceable></option></arg>
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59 <arg><option>-t <replaceable class="parameter">timeout</replaceable></option></arg>
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60 </cmdsynopsis>
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61 </refsynopsisdiv>
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63 <refsect1 id='options.1'>
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64 <title>Options</title>
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65 <variablelist>
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66 <varlistentry>
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67 <term>-c</term>
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68 <listitem><para>
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69 Load the configuration file, print a cannonical form
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70 of the configuration on stdout, and exit.
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71 </para></listitem>
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72 </varlistentry>
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73 <varlistentry>
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74 <term>-s</term>
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75 <listitem><para>
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76 Stress test the configuration loading code by repeating
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77 the load/free cycle in an infinite loop.
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78 </para></listitem>
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79 </varlistentry>
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80 <varlistentry>
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81 <term>-d <replaceable class="parameter">n</replaceable></term>
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82 <listitem><para>
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83 Set the debug level to <replaceable class="parameter">n</replaceable>.
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84 </para></listitem>
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85 </varlistentry>
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86 <varlistentry>
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87 <term>-e <replaceable class="parameter">from|to</replaceable></term>
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88 <listitem><para>
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89 Print the results of looking up the from and to addresses in the
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90 current configuration. The | character is used to separate the from and to
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91 addresses in the argument to the -e switch.
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92 </para></listitem>
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93 </varlistentry>
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94 <varlistentry>
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95 <term>-b <replaceable class="parameter">local-domain-socket-file-name</replaceable></term>
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96 <listitem><para>
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97 Set the local socket used for the connection to the dccifd daemon.
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98 This is typically /var/dcc/dccifd.
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99 </para></listitem>
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100 </varlistentry>
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101 <varlistentry>
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102 <term>-r <replaceable class="parameter">local-domain-socket-file-name</replaceable></term>
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103 <listitem><para>
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104 Set the local socket used for the connection to our own dns resolver processes.
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105 </para></listitem>
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106 </varlistentry>
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107 <varlistentry>
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108 <term>-p <replaceable class="parameter">sendmail-socket</replaceable></term>
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109 <listitem><para>
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110 Set the socket used for the milter connection to sendmail. This is either
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111 "inet:port@ip-address" or "local:local-domain-socket-file-name".
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112 </para></listitem>
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113 </varlistentry>
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114 <varlistentry>
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115 <term>-t <replaceable class="parameter">timeout</replaceable></term>
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116 <listitem><para>
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117 Set the timeout in seconds used for communication with sendmail.
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118 </para></listitem>
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119 </varlistentry>
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120 </variablelist>
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121 </refsect1>
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122
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123 <refsect1 id='usage.1'>
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124 <title>Usage</title>
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125 <para><command>@PACKAGE@</command> -c</para>
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126 <para><command>@PACKAGE@</command> -s</para>
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127 <para><command>@PACKAGE@</command> -e 'someone@aol.com|localname@mydomain.tld'</para>
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128 <para><command>@PACKAGE@</command> -d 10 -r resolver.sock -p local:dnsbl.sock</para>
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129 </refsect1>
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130
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131 <refsect1 id='installation.1'>
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132 <title>Installation</title>
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133 <para>
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134 This is now a standard GNU autoconf/automake installation, so the normal
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135 "./configure; make; su; make install" works. "make chkconfig" will
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136 setup the init.d runlevel scripts. Alternatively, you can use the
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137 source or binary RPMs at <ulink
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138 url="http://www.five-ten-sg.com/@PACKAGE@/packages">http://www.five-ten-sg.com/@PACKAGE@/packages</ulink>.
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139 </para>
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140 <para>
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141 Note that this has ONLY been tested on Linux, specifically RedHat Linux.
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142 In particular, this milter makes no attempt to understand IPv6. Your
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143 mileage will vary. You will need at a minimum a C++ compiler with a
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144 minimally thread safe STL implementation. The distribution includes a
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145 test.cpp program. If it fails this milter won't work. If it passes,
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146 this milter might work.
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147 </para>
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148 <para>
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149 Modify your sendmail.mc by removing all the "FEATURE(dnsbl" lines, add
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150 the following line in your sendmail.mc and rebuild the .cf file
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151 </para>
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152 <para><screen>INPUT_MAIL_FILTER(`dnsbl', `S=local:/var/run/dnsbl/dnsbl.sock, F=T, T=C:30s;S:5m;R:5m;E:5m')</screen></para>
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153 <para>
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154 Modify the default <citerefentry>
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155 <refentrytitle>@PACKAGE@.conf</refentrytitle> <manvolnum>5</manvolnum>
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156 </citerefentry> configuration.
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157 </para>
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158 </refsect1>
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159
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160 <refsect1 id='configuration.1'>
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161 <title>Configuration</title>
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162 <para>
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163 The configuration file is documented in <citerefentry>
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164 <refentrytitle>@PACKAGE@.conf</refentrytitle> <manvolnum>5</manvolnum>
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165 </citerefentry>. Any change to the config file, or any file included
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166 from that config file, will cause it to be reloaded within three
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167 minutes.
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168 </para>
108
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169 </refsect1>
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170
108
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171 <refsect1 id='introduction.1'>
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172 <title>Introduction</title>
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173 <para>
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174 Consider the case of a mail server that is acting as secondary MX for a
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175 collection of clients, each of which has a collection of mail domains.
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176 Each client may use their own collection of DNSBLs on their primary mail
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177 server. We present here a mechanism whereby the backup mail server can
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178 use the correct set of DNSBLs for each recipient for each message. As a
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179 side-effect, it gives us the ability to customize the set of DNSBLs on a
183
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180 per-recipient basis, so that fred@example.com could use LOCAL and the
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181 SBL, where all other users @example.com use only the SBL.
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182 </para>
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183 <para>
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184 This milter can also verify the envelope from/recipient pairs with the
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185 primary MX server. This allows the backup mail servers to properly
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186 reject mail sent to invalid addresses. Otherwise, the backup mail
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187 servers will accept that mail, and then generate a bounce message when
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188 the message is forwarded to the primary server (and rejected there with
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189 no such user). These rejections are the primary cause of such backscatter.
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190 </para>
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191 <para>
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192 This milter will also decode (uuencode, base64, mime, html entity, url
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193 encodings) and scan for HTTP and HTTPS URLs and bare hostnames in the
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194 body of the mail. If any of those host names have A or NS records on
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195 the SBL (or a single configurable DNSBL), the mail will be rejected
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196 unless previously whitelisted. This milter also counts the number of
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197 invalid HTML tags, and can reject mail if that count exceeds your
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198 specified limit.
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199 </para>
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200 <para>
259
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201 This milter can also impose hourly and daily rate
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202 limits on the number of recipients accepted from SMTP
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203 AUTH connections, that would otherwise be allowed to
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204 relay thru this mail server with no spam filtering. If
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205 the connection does not use SMTP AUTH, the rate limits
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206 may be specified by the mail from email address or
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207 domain.
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208 </para>
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209 <para>
284
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210 This milter can also impose hourly and daily limits on the number of
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211 different ip addresses used for SMTP AUTH connections. If a single
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212 user is connecting from too many different ip addresses, we presume that
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213 their authentication credentials have been discovered, and block their
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214 outgoing mail.
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215 </para>
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216 <para>
162
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217 Consider the case of a message from A to B passing thru this milter. If
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218 that message is not blocked, then we might eventually see a reply
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219 message from B to A. If the filtering context for A includes an
162
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220 autowhite entry, and that context does <emphasis>not</emphasis> cover B
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221 as a recipient, then this milter will add an entry in that file to
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222 whitelist such replies for a configurable time period. Suppose A and B
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223 are in the same domain, or at least use the same filtering context. In
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224 that case we don't want to add a whitelist entry for B, since that would
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225 then allow spammers to send mail from B (forged) to B. Such autowhite
160
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226 files need to be writeable by the dnsbl user, where all the other dnsbl
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227 configuration files only need to be readable by the dnsbl user.
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228 </para>
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229 <para>
176
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230 You can manually add such an autowhite entry, by appending a single
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231 text line to the autowhitelist file, using something like
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232 <command>echo "$mail 0" >>$autowhitefile</command>.
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233 You can manually remove such an autowhite entry, by appending a single
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234 text line to the autowhitelist file, using something like
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235 <command>echo "$mail 1" >>$autowhitefile</command>.
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236 </para>
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237 <para>
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238 The DNSBL milter reads a text configuration file (dnsbl.conf) on
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239 startup, and whenever the config file (or any of the referenced include
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240 files) is changed. The entire configuration file is case insensitive.
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241 If the configuration cannot be loaded due to a syntax error, the milter
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242 will log the error and quit. If the configuration cannot be reloaded
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243 after being modified, the milter will log the error and send an email to
152
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244 root from dnsbl@$hostname. You probably want to add dnsbl@$hostname
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245 to your /etc/mail/virtusertable since otherwise sendmail will reject
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246 that message.
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247 </para>
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248 </refsect1>
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249
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250 <refsect1 id='dcc.1'>
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251 <title>DCC Issues</title>
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252 <para>
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253 If you are also using the <ulink
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254 url="http://www.rhyolite.com/anti-spam/dcc/">DCC</ulink> milter, there
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255 are a few considerations. You may need to whitelist senders from the
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256 DCC bulk detector, or from the DNS based lists. Those are two very
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257 different reasons for whitelisting. The former is done thru the DCC
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258 whiteclnt config file, the later is done thru the DNSBL milter config
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259 file.
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260 </para>
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261 <para>
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262 You may want to blacklist some specific senders or sending domains.
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263 This could be done thru either the DCC (on a global basis, or for a
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264 specific single recipient). We prefer to do such blacklisting via the
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265 DNSBL milter config, since it can be done for a collection of recipient
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266 mail domains. The DCC approach has the feature that you can capture the
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267 entire message in the DCC log files. The DNSBL milter approach has the
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268 feature that the mail is rejected earlier (at RCPT TO time), and the
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269 sending machine just gets a generic "550 5.7.1 no such user" message.
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270 </para>
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271 <para>
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272 The DCC whiteclnt file can be included in the DNSBL milter config by the
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273 dcc_to and dcc_from statements. This will import the (env_to, env_from,
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274 and substitute mail_host) entries from the DCC config into the DNSBL
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275 config. This allows using the DCC config as the single point for
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276 white/blacklisting.
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277 </para>
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278 <para>
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279 Consider the case where you have multiple clients, each with their own
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280 mail servers, and each running their own DCC milters. Each client is
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281 using the DCC facilities for envelope from/to white/blacklisting.
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282 Presumably you can use rsync or scp to fetch copies of your clients DCC
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283 whiteclnt files on a regular basis. Your mail server, acting as a
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284 backup MX for your clients, can use the DNSBL milter, and include those
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285 client DCC config files. The envelope from/to white/blacklisting will
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286 be appropriately tagged and used only for the domains controlled by each
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287 of those clients.
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288 </para>
179
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289 <para>
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290 You can now use (via dccifd) different dcc filtering parameters on a per
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291 context basis. See the dcc_greylist and dcc_bulk_threshold statements
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292 in the <citerefentry> <refentrytitle>@PACKAGE@.conf</refentrytitle>
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293 <manvolnum>5</manvolnum> </citerefentry> configuration. Those
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294 statements are only active if you supply the <option>-b</option> option
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295 on the dnsbl command line. If you use the dcc via the standard dcc
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296 milter (dccm), then connections from clients that use SMTP AUTH are
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297 still subject to greylisting. If you use the dcc via dccifd and this
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298 milter, then connections from clients that use SMTP AUTH are never
180
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299 subject to greylisting. As part of this per-user greylisting, you need
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300 to move the dnsblnogrey file from the config directory to something
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301 like /var/dcc/userdirs/dnsblnogrey/whiteclnt so the dccifd will
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302 properly ignore greylisting for those recipients that don't want it.
179
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303 </para>
108
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304 </refsect1>
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305
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306 <refsect1 id='definitions.1'>
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307 <title>Definitions</title>
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308 <para>
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309 CONTEXT - a collection of parameters that defines the filtering context
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310 to be used for a collection of envelope recipient addresses. The
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311 context includes such things as the list of DNSBLs to be used, and the
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312 various content filtering parameters.
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313 </para>
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314 <para>
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315 DNSBL - a named DNS based blocking list is defined by a dns suffix (e.g.
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316 sbl-xbl.spamhaus.org) and a message string that is used to generate the
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317 "550 5.7.1" smtp error return code. The names of these DNSBLs will be
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318 used to define the DNSBL-LISTs.
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319 </para>
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320 <para>
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321 DNSBL-LIST - a named list of DNSBLs that will be used for specific
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322 recipients or recipient domains.
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323 </para>
249
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324 <para>
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325 DNSWL - a named DNS based white list is defined by a dns suffix (e.g.
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diff changeset
326 list.dnswl.org) and an integer level. If the level is greater than or
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diff changeset
327 equal to x in the 127.0.z.x return code from the white list, then the
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diff changeset
328 ip address is considered to match, and the message will be whitelisted.
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diff changeset
329 The names of these DNSWLs will be used to define the DNSWL-LISTs.
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330 </para>
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331 <para>
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diff changeset
332 DNSWL-LIST - a named list of DNSWLs that will be used for specific
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diff changeset
333 recipients or recipient domains.
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334 </para>
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335 </refsect1>
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336
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337 <refsect1 id='filtering.1'>
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338 <title>Filtering Procedure</title>
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339 <para>
152
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340 The SMTP envelope 'from' and 'to' values are used in various checks.
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341 The first check is to see if a reply message (swapping the env_from and
160
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342 env_to values) would be unconditionally blocked (just based on the
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343 envelope from address). That check is similar to the main check
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344 described below, but there is no body content to be scanned, and there
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345 is no client connection ip address to be checked against DNSBLs. If
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346 such a reply message would be blocked, we also block the original
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347 outgoing message. This prevents folks from sending mail to recipients
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348 that are unable to reply.
152
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349 </para>
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350 <para>
284
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351 If the client has authenticated with sendmail, the recipient rate limits
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diff changeset
352 and connection ip address limits are
268
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353 checked. If the authenticated user has not exceeded the hourly or daily rate
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parents: 263
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354 limits, then the mail is accepted, the filtering contexts are not used,
284
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parents: 278
diff changeset
355 the dns lists are not checked, and the body content is not scanned. These
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parents: 278
diff changeset
356 rate limits can also be applied to unauthenticated connections, in which case
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parents: 278
diff changeset
357 the envelope from value is used as the authentication id for lookup purposes.
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parents: 278
diff changeset
358 If
136
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359 the client has not authenticated with sendmail, we follow these steps
f4746d8a12a3 add smtp auth rate limits
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360 for each recipient.
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361 </para>
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362 <orderedlist>
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363 <listitem><para>
108
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364 The envelope to email address is used to find an initial filtering
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365 context. We first look for a context that specified the full email
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366 address in the env_to statement. If that is not found, we look for a
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367 context that specified the entire domain name of the envelope recipient
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368 in the env_to statement. If that is not found, we look for a context
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369 that specified the user@ part of the envelope recipient in the env_to
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370 statement. If that is not found, we use the first top level context
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371 defined in the config file.
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372 </para></listitem>
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373 <listitem><para>
108
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374 The initial filtering context may redirect to a child context based on
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375 the values in the initial context's env_from statement. We look for [1)
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parents: 104
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376 the full envelope from email address, 2) the domain name part of the
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parents: 104
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377 envelope from address, 3) the user@ part of the envelope from address]
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378 in that context's env_from statement, with values that point to a child
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379 context. If such an entry is found, we switch to that child filtering
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380 context.
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381 </para></listitem>
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382 <listitem><para>
108
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383 We lookup [1) the full envelope from email address, 2) the domain name
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parents: 104
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384 part of the envelope from address, 3) the user@ part of the envelope
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parents: 104
diff changeset
385 from address] in the filtering context env_from statement. That results
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386 in one of (white, black, unknown, inherit).
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387 </para></listitem>
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388 <listitem><para>
108
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389 If the answer is black, mail to this recipient is rejected with "no such
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390 user", and the dns lists are not checked.
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391 </para></listitem>
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392 <listitem><para>
436
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parents: 426
diff changeset
393 If the answer is white, the mail is not from localhost,
458
6c1c2bd9fb54 ignore dnswl entries if the sender is <>
Carl Byington <carl@five-ten-sg.com>
parents: 451
diff changeset
394 and the envelope from domain name is listed in the current (or parents)
6c1c2bd9fb54 ignore dnswl entries if the sender is <>
Carl Byington <carl@five-ten-sg.com>
parents: 451
diff changeset
395 filtering contexts dkim_from with "required_signed" or "unsigned_black",
6c1c2bd9fb54 ignore dnswl entries if the sender is <>
Carl Byington <carl@five-ten-sg.com>
parents: 451
diff changeset
396 we downgrade this white answer to unknown. If the answer is still white,
6c1c2bd9fb54 ignore dnswl entries if the sender is <>
Carl Byington <carl@five-ten-sg.com>
parents: 451
diff changeset
397 mail to this recipient is accepted and the dns lists are not checked.
111
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398 </para></listitem>
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399 <listitem><para>
108
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400 If the answer is unknown, we don't reject yet, but the dns lists will be
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parents: 104
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401 checked, and the content may be scanned.
111
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402 </para></listitem>
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403 <listitem><para>
108
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404 If the answer is inherit, we repeat the envelope from search in the
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405 parent context.
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406 </para></listitem>
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407 <listitem><para>
233
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parents: 216
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408 If the mail has not been accepted or rejected yet, and the filtering
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
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parents: 216
diff changeset
409 context (or any ancestor context) specifies a non-empty whitelist regular
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parents: 216
diff changeset
410 expression, then we check the envelope from value against that regex.
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
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parents: 216
diff changeset
411 The mail is accepted if the envelope from value matches the specified regular
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parents: 216
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412 expression.
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parents: 216
diff changeset
413 </para></listitem>
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parents: 216
diff changeset
414 <listitem><para>
458
6c1c2bd9fb54 ignore dnswl entries if the sender is <>
Carl Byington <carl@five-ten-sg.com>
parents: 451
diff changeset
415 If the mail has not been accepted or rejected yet, and the envelope from
6c1c2bd9fb54 ignore dnswl entries if the sender is <>
Carl Byington <carl@five-ten-sg.com>
parents: 451
diff changeset
416 email address is not empty, the dns white lists
249
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parents: 246
diff changeset
417 specified in the filtering context are checked and the mail is accepted
15bf4f68a0b2 Add dnswl support
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parents: 246
diff changeset
418 if any list has an A record for the standard dns based lookup scheme
15bf4f68a0b2 Add dnswl support
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parents: 246
diff changeset
419 (reversed octets of the client followed by the dns suffix) with a final
15bf4f68a0b2 Add dnswl support
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parents: 246
diff changeset
420 octet greater than or equal to the level specified for that dnswl.
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parents: 246
diff changeset
421 </para></listitem>
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parents: 246
diff changeset
422 <listitem><para>
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parents: 246
diff changeset
423 If the mail has not been accepted or rejected yet, the dns black lists
168
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carl
parents: 167
diff changeset
424 specified in the filtering context are checked and the mail is rejected
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
425 if any list has an A record for the standard dns based lookup scheme
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
426 (reversed octets of the client followed by the dns suffix).
6bac960af6b4 add generic reverse dns filtering regex
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parents: 167
diff changeset
427 </para></listitem>
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
428 <listitem><para>
6bac960af6b4 add generic reverse dns filtering regex
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parents: 167
diff changeset
429 If the mail has not been accepted or rejected yet, and the filtering
268
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parents: 263
diff changeset
430 context (or any ancestor context) requires matching reverse dns client
f941563c2a95 Add require_rdns checking
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parents: 263
diff changeset
431 name, the mail is rejected if the client name is empty or forged.
f941563c2a95 Add require_rdns checking
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parents: 263
diff changeset
432 </para></listitem>
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parents: 263
diff changeset
433 <listitem><para>
f941563c2a95 Add require_rdns checking
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parents: 263
diff changeset
434 If the mail has not been accepted or rejected yet, and the filtering
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parents: 168
diff changeset
435 context (or any ancestor context) specifies a non-empty generic regular
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carl
parents: 168
diff changeset
436 expression, then we check the fully qualified client name (obtained via
bd33eaccfed8 fix pre/post scripts in rpm spec file
carl
parents: 168
diff changeset
437 the sendmail macro "_"). The mail is rejected if the client name
bd33eaccfed8 fix pre/post scripts in rpm spec file
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parents: 168
diff changeset
438 matches the specified regular expression.
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439 </para></listitem>
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440 <listitem><para>
108
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parents: 104
diff changeset
441 If the mail has not been accepted or rejected yet, we look for a
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carl
parents: 104
diff changeset
442 verification context, which is the closest ancestor of the filtering
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carl
parents: 104
diff changeset
443 context that both specifies a verification host, and which covers the
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parents: 104
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444 envelope to address. If we find such a verification context, and the
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parents: 104
diff changeset
445 verification host is not our own hostname, we open an smtp conversation
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parents: 104
diff changeset
446 with that verification host. The current envelope from and recipient to
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diff changeset
447 values are passed to that verification host. If we receive a 5xy
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diff changeset
448 response those commands, we reject the current recipient with "no such
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diff changeset
449 user".
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450 </para></listitem>
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451 <listitem><para>
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452 If the mail has not been accepted or rejected yet, and the filtering
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parents: 104
diff changeset
453 context enables content filtering, and this is the first such recipient
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diff changeset
454 in this smtp transaction, we set the content filtering parameters from
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diff changeset
455 this context, and enable content filtering for the body of this message.
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456 </para></listitem>
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457 </orderedlist>
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458 <para>
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459 For each recipient that was accepted, we search for an autowhite entry
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diff changeset
460 starting in the reply filtering context. If an autowhite entry is found,
458
6c1c2bd9fb54 ignore dnswl entries if the sender is <>
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parents: 451
diff changeset
461 and the local part of the recipient address is shorter than 35 characters,
160
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parents: 158
diff changeset
462 we add the recipient to that auto whitelist file. This will prevent reply
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diff changeset
463 messages from being blocked by the dnsbl or content filtering.
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diff changeset
464 </para>
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diff changeset
465 <para>
436
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Carl Byington <carl@five-ten-sg.com>
parents: 426
diff changeset
466 If the mail is from localhost we skip the following dkim checks, since
7b072e16bd69 fix syslog for long messages, supress dkim checks for mail from localhost
Carl Byington <carl@five-ten-sg.com>
parents: 426
diff changeset
467 such mail will never be dkim signed. This is typically mail that is generated by
7b072e16bd69 fix syslog for long messages, supress dkim checks for mail from localhost
Carl Byington <carl@five-ten-sg.com>
parents: 426
diff changeset
468 apache forms.
7b072e16bd69 fix syslog for long messages, supress dkim checks for mail from localhost
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parents: 426
diff changeset
469 </para>
7b072e16bd69 fix syslog for long messages, supress dkim checks for mail from localhost
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parents: 426
diff changeset
470 <para>
395
a8cf6a3da907 document dkim/spf processing
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parents: 360
diff changeset
471 If content filtering is enabled for this body, we look for dkim_signer
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
472 and dkim_from sections in the current context and parents. We collect the
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
473 signers of this message from the header added by the dkim-milter. If any
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
474 of the message signers are whitelisted, the message is accepted.
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
475 </para>
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
476 <para>
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
477 If the header from domain maps to required_signed then:
451
f2bc221240e8 add unsigned_black for enforcement of dmarc policy
Carl Byington <carl@five-ten-sg.com>
parents: 436
diff changeset
478 If any of the message signers are in that list, or if
f2bc221240e8 add unsigned_black for enforcement of dmarc policy
Carl Byington <carl@five-ten-sg.com>
parents: 436
diff changeset
479 the source ip address passes a strong spf check for the header from
395
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
480 domain, the message is accepted. Otherwise, the message is rejected.
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
481 </para>
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
482 <para>
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
483 If the header from domain maps to signed_white then:
451
f2bc221240e8 add unsigned_black for enforcement of dmarc policy
Carl Byington <carl@five-ten-sg.com>
parents: 436
diff changeset
484 If any of the message signers are in that list, or if
f2bc221240e8 add unsigned_black for enforcement of dmarc policy
Carl Byington <carl@five-ten-sg.com>
parents: 436
diff changeset
485 the source ip address passes a strong spf check for the header from
395
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
486 domain, the message is accepted. Otherwise, processing continues.
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
487 </para>
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
488 <para>
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
489 If the header from domain maps to signed_black then:
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
490 If any of the message signers are in that list, the message is rejected.
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
491 Otherwise, processing continues.
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
492 </para>
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
493 <para>
451
f2bc221240e8 add unsigned_black for enforcement of dmarc policy
Carl Byington <carl@five-ten-sg.com>
parents: 436
diff changeset
494 If the header from domain maps to unsigned_black then:
f2bc221240e8 add unsigned_black for enforcement of dmarc policy
Carl Byington <carl@five-ten-sg.com>
parents: 436
diff changeset
495 If any of the message signers are in that list, or if
f2bc221240e8 add unsigned_black for enforcement of dmarc policy
Carl Byington <carl@five-ten-sg.com>
parents: 436
diff changeset
496 the source ip address passes a strong spf check for the header from
f2bc221240e8 add unsigned_black for enforcement of dmarc policy
Carl Byington <carl@five-ten-sg.com>
parents: 436
diff changeset
497 domain, processing continues. Otherwise, the message is rejected.
458
6c1c2bd9fb54 ignore dnswl entries if the sender is <>
Carl Byington <carl@five-ten-sg.com>
parents: 451
diff changeset
498 This is very close to enforcing DMARC for the header from domain.
451
f2bc221240e8 add unsigned_black for enforcement of dmarc policy
Carl Byington <carl@five-ten-sg.com>
parents: 436
diff changeset
499 </para>
f2bc221240e8 add unsigned_black for enforcement of dmarc policy
Carl Byington <carl@five-ten-sg.com>
parents: 436
diff changeset
500 <para>
397
d08da4b058e8 only ntohl() once during recursive spf txt processing
Carl Byington <carl@five-ten-sg.com>
parents: 395
diff changeset
501 If any of the message signers are blacklisted, the message is rejected.
395
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
502 </para>
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
503 <para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
504 If content filtering is enabled for this body, the mail text is decoded
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
505 (uuencode, base64, mime, html entity, url encodings), and scanned for HTTP
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
506 and HTTPS URLs or bare host names. Hostnames must be either ip address
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
507 literals, or must end in a string defined by the TLD list. The first
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
508 &lt;configurable&gt; host names are checked as follows.
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
509 </para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
510 <para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
511 The only known list that is suitable for the content filter DNSBL is the
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
512 SBL. If the content filter DNSBL is defined, and any of those host
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
513 names resolve to ip addresses that are on that DNSBL (or have
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
514 nameservers that are on that list), and the host name is not on the
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
515 &lt;configurable&gt; ignore list, the mail is rejected.
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
516 </para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
517 <para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
518 If the content uribl DNSBL is defined, and any of those host names are
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
519 on that DNSBL, and the host name is not on the &lt;configurable&gt;
270
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
Carl Byington <carl@five-ten-sg.com>
parents: 268
diff changeset
520 ignore list, the mail is rejected. There are three lists that are suitable
284
896b9393d3f0 Fix segfault caused by freeing unallocated memory
Carl Byington <carl@five-ten-sg.com>
parents: 278
diff changeset
521 here, URIBL, SURBL, and DBL.
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
522 </para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
523 <para>
167
9b129ed78d7d actually use spamassassin result, allow build without spam assassin, only call it if some recipient needs it.
carl
parents: 164
diff changeset
524 If any non-whitelisted recipient has a filtering context with a non-zero
9b129ed78d7d actually use spamassassin result, allow build without spam assassin, only call it if some recipient needs it.
carl
parents: 164
diff changeset
525 spamassassin limit, then the message is passed thru spamassassin (via
9b129ed78d7d actually use spamassassin result, allow build without spam assassin, only call it if some recipient needs it.
carl
parents: 164
diff changeset
526 spamc), and the message is rejected for those recipients with spamassassin
203
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
527 limits less than the resulting spamassassin score. For example, a
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
528 spamassassin limit of three will reject messages with spamassassin scores
246
8b0f16abee53 Add prvs decoding to envelope addresses
Carl Byington <carl@five-ten-sg.com>
parents: 233
diff changeset
529 of four or greater. If the filtering context has a spamassassin limit of
8b0f16abee53 Add prvs decoding to envelope addresses
Carl Byington <carl@five-ten-sg.com>
parents: 233
diff changeset
530 zero, then spamassassin is not called (or if called the results are not used)
8b0f16abee53 Add prvs decoding to envelope addresses
Carl Byington <carl@five-ten-sg.com>
parents: 233
diff changeset
531 for this recipient.
203
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
532 </para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
533 <para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
534 If any non-whitelisted recipient has a filtering context that specifies
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
535 DCC greylisting, then the message is passed thru the DCC bulk detector,
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
536 and the message is greylisted (for all recipients) if the DCC says this
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
537 message should be delayed.
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
538 </para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
539 <para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
540 If any non-whitelisted recipient has a filtering context with a non-zero
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
541 DCC bulk threshold, then the message is passed thru the DCC bulk detector,
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
542 and the message is rejected for those recipients with DCC thresholds less
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
543 than or equal to the DCC bulk score.
163
97d7da45fe2a spamassassin changes
carl
parents: 162
diff changeset
544 </para>
97d7da45fe2a spamassassin changes
carl
parents: 162
diff changeset
545 <para>
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
546 We also scan for excessive bad html tags, and if a &lt;configurable&gt;
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
547 limit is exceeded, the mail is rejected.
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
548 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
549 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
550
407
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
551 <refsect1 id='dmarc.1'>
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
552 <title>DMARC vs dkim_from require_signed</title>
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
553 <para>
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
554 Note that DNSBL does not implement rfc7489 DMARC. We do not look for
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
555 _dmarc.$DOMAIN txt records.
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
556 </para>
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
557 <para>
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
558 The restrictions imposed by require_signed are similar but not
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
559 identical to a DMARC reject policy with strict identifier alignment.
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
560 When doing SPF fallback, DMARC checks SPF based on the rfc5321
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
561 envelope from domain. DNSBL checks SPF based on the rfc5322 header
426
beda588f2881 include sample dkim config
Carl Byington <carl@five-ten-sg.com>
parents: 414
diff changeset
562 from domain.
409
e018ed19a1cc require 3 dots in bare ip addresses
Carl Byington <carl@five-ten-sg.com>
parents: 407
diff changeset
563 DMARC does not allow mail from good.example.com to be
407
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
564 signed by trusted.example.net - which is a common case. Both Microsoft
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
565 Office365 and Google run mail for customer domains, but use DKIM
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
566 signing domains in onmicrosoft.com and gappssmtp.com, which are
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
567 unrelated to the customer domain. DMARC in the default relaxed
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
568 alignment mode allows evil.example.com to sign mail from
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
569 good.example.com. DNSBL specifies the exact list of acceptable signing
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
570 domains, rather than inferring it from child/parent relationships, or
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
571 using public
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
572 suffix lists to find the organizational domain. We can block mail
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
573 from marketing.example.com while accepting mail from
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
574 billing.example.com, even if both are DKIM signed by example.com.
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
575 </para>
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
576 <para>
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
577 Suppose we have:
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
578 <literallayout class="monospaced"><![CDATA[
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
579 rfc5321 envelope from = one@evil.example.com
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
580 rfc5322 header from = two@good.example.com
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
581 authentication results = dkim pass header.d=other.example.com
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
582 _dmarc.good.example.com txt = "v=DMARC1; p=reject; adkim:s aspf:s"
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
583 dkim_from {good.example.com require_signed other.example.com;}
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
584 ]]></literallayout>
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
585 DMARC would fail the strict identifier alignment. DNSBL allows
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
586 us to require DKIM signatures that are unrelated
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
587 to the rfc5322 header from, so we accept this message.
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
588 </para>
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
589 <para>
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
590 Suppose we have:
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
591 <literallayout class="monospaced"><![CDATA[
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
592 rfc5321 envelope from = one@evil.example.com
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
593 rfc5322 header from = two@good.example.com
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
594 authentication results = dkim pass header.d=other.example.net
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
595 _dmarc.good.example.com txt = "v=DMARC1; p=reject; adkim:r aspf:r"
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
596 dkim_from {good.example.com require_signed other.example.net;}
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
597 ]]></literallayout>
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
598 DMARC would pass the relaxed spf identifier alignments,
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
599 and would check the evil.example.com spf record. If that
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
600 allowed the source ip, DMARC would accept the message.
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
601 DMARC would not check DKIM since example.com and example.net
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
602 do not pass even the relaxed identifer alignment requirement.
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
603 DNSBL allows us to require DKIM signatures that are not
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
604 related to the rfc5322 header from domain, so we accept
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
605 the message based on the DKIM signature and don't need to
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
606 fall back to SPF.
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
607 </para>
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
608 <para>
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
609 Suppose we have:
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
610 <literallayout class="monospaced"><![CDATA[
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
611 rfc5321 envelope from = one@evil.example.com
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
612 rfc5322 header from = two@good.example.com
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
613 authentication results = dkim fail header.d=other.example.net
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
614 _dmarc.good.example.com txt = "v=DMARC1; p=reject; adkim:r aspf:r"
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
615 evil.example.com txt = "v=spf1 ... including the source ip
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
616 good.example.com txt = "v=spf1 ... not including the source ip
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
617 dkim_from {good.example.com require_signed other.example.net;}
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
618 ]]></literallayout>
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
619 DNSBL allows us to require DKIM signatures that are not
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
620 related to the rfc5322 header from domain. In this case
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
621 the signature fails, so we fall back to an SPF check.
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
622 We check SPF based on the rfc5322 header from, and
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
623 good.example.com does not allow the source ip, so we reject
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
624 this message.
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
625 DMARC would accept that message based on the SPF check
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
626 for evil.example.com
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
627 </para>
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
628 </refsect1>
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
629
111
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carl
parents: 108
diff changeset
630 <refsect1 id='access.1'>
108
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carl
parents: 104
diff changeset
631 <title>Sendmail access vs. DNSBL</title>
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carl
parents: 104
diff changeset
632 <para>
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carl
parents: 104
diff changeset
633 With the standard sendmail.mc dnsbl FEATURE, the dnsbl checks may be
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carl
parents: 104
diff changeset
634 suppressed by entries in the /etc/mail/access database. For example,
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carl
parents: 104
diff changeset
635 suppose you control a /18 of address space, and have allocated some /24s
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carl
parents: 104
diff changeset
636 to some clients. You have access entries like
111
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carl
parents: 108
diff changeset
637 <literallayout class="monospaced"><![CDATA[
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carl
parents: 108
diff changeset
638 192.168.4 OK
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carl
parents: 108
diff changeset
639 192.168.17 OK]]></literallayout>
108
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carl
parents: 104
diff changeset
640 </para>
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carl
parents: 104
diff changeset
641 <para>
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carl
parents: 104
diff changeset
642 to allow those clients to smarthost thru your mail server. Now if one
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
643 of those clients happens get infected with a virus that turns a machine
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
644 into an open proxy, and their 192.168.4.45 lands on the SBL-XBL, you
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carl
parents: 104
diff changeset
645 will still wind up allowing that infected machine to smarthost thru your
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
646 mail servers.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
647 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
648 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
649 With this DNSBL milter, the sendmail access database cannot override the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
650 dnsbl checks, so that machine won't be able to send mail to or thru your
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
651 smarthost mail server (unless the virus/proxy can use smtp-auth).
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
652 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
653 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
654 Using the standard sendmail features, you would add access entries to
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
655 allow hosts on your local network to relay thru your mail server. Those
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
656 OK entries in the sendmail access database will override all the dnsbl
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
657 checks. With this DNSBL milter, you will need to have the local users
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
658 authenticate with smtp-auth to get the same effect. You might find
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
659 <ulink
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
660 url="http://www.ists.dartmouth.edu/classroom/sendmail-ssl-how-to.php">
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
661 these directions</ulink> helpful for setting up smtp-auth if you are on
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
662 RH Linux.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
663 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
664 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
665
111
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carl
parents: 108
diff changeset
666 <refsect1 id='performance.1'>
108
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carl
parents: 104
diff changeset
667 <title>Performance Issues</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
668 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
669 Consider a high volume high performance machine running sendmail. Each
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
670 sendmail process can do its own dns resolution. Typically, such dns
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
671 resolver libraries are not thread safe, and so must be protected by some
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
672 sort of mutex in a threaded environment. When we add a milter to
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
673 sendmail, we now have a collection of sendmail processes, and a
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
674 collection of milter threads.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
675 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
676 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
677 We will be doing a lot of dns lookups per mail message, and at least
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
678 some of those will take many tens of seconds. If all this dns work is
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
679 serialized inside the milter, we have an upper limit of about 25K mail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
680 messages per day. That is clearly not sufficient for many sites.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
681 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
682 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
683 Since we want to do parallel dns resolution across those milter threads,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
684 we add another collection of dns resolver processes. Each sendmail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
685 process is talking to a milter thread over a socket, and each milter
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
686 thread is talking to a dns resolver process over another socket.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
687 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
688 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
689 Suppose we are processing 20 messages per second, and each message
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
690 requires 20 seconds of dns work. Then we will have 400 sendmail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
691 processes, 400 milter threads, and 400 dns resolver processes. Of
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
692 course that steady state is very unlikely to happen.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
693 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
694 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
695
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
696
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
697 <refsect1 id='rejected.1'>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
698 <title>Rejected Ideas</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
699 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
700 The following ideas have been considered and rejected.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
701 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
702 <para>
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
703 Add max_recipients setting to the context configuration. Recipients in
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
704 excess of that limit will be rejected, and all the non-whitelisted
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
705 recipients will be removed. Current spammers *very* rarely send more
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
706 than ten recipients in a single smtp transaction, so this won't stop any
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
707 significant amount of spam.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
708 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
709 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
710 Add poison addresses to the configuration. If any recipient is
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
711 poison, all recipients are rejected even if they would be whitelisted,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
712 and the data is rejected if sent. I have a collection of spam trap
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
713 addresses that would be suitable for such use. Based on my log files,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
714 any mail to those spam trap addresses is rejected based on either dnsbl
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
715 lookups or the DCC. So this won't result in blocking any additional
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
716 spam.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
717 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
718 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
719 Add an option to only allow one recipient if the return path is
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
720 empty. Based on my log files, there is no mail that violates this
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
721 check.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
722 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
723 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
724 Reject the mail if the envelope from domain name contains any MX
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
725 records pointing to 127.0.0.0/8. I don't see any significant amount of
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
726 spam sent with such domain names.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
727 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
728 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
729
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
730 <refsect1 id='todo.1'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
731 <title>TODO</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
732 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
733 The following ideas are under consideration.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
734 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
735 <para>
414
d5a1ed33d3ae spf code now handles mx,exists,ptr tags, multiple A records, %{i} macro
Carl Byington <carl@five-ten-sg.com>
parents: 409
diff changeset
736 More complete SPF check.
d5a1ed33d3ae spf code now handles mx,exists,ptr tags, multiple A records, %{i} macro
Carl Byington <carl@five-ten-sg.com>
parents: 409
diff changeset
737 </para>
d5a1ed33d3ae spf code now handles mx,exists,ptr tags, multiple A records, %{i} macro
Carl Byington <carl@five-ten-sg.com>
parents: 409
diff changeset
738 <para>
276
19ff60eaab74 more tld entries
Carl Byington <carl@five-ten-sg.com>
parents: 270
diff changeset
739 Add config switch to require the HELO argument to resolve to an ip address.
19ff60eaab74 more tld entries
Carl Byington <carl@five-ten-sg.com>
parents: 270
diff changeset
740 </para>
19ff60eaab74 more tld entries
Carl Byington <carl@five-ten-sg.com>
parents: 270
diff changeset
741 <para>
270
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
Carl Byington <carl@five-ten-sg.com>
parents: 268
diff changeset
742 Add white/unknown to config for smtp authenticated connections. Currently
284
896b9393d3f0 Fix segfault caused by freeing unallocated memory
Carl Byington <carl@five-ten-sg.com>
parents: 278
diff changeset
743 any authenticated connection is fully whitelisted. The only spam control
896b9393d3f0 Fix segfault caused by freeing unallocated memory
Carl Byington <carl@five-ten-sg.com>
parents: 278
diff changeset
744 on those connections is rate limiting. This feature would allow content based
270
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
Carl Byington <carl@five-ten-sg.com>
parents: 268
diff changeset
745 spam controls to be applied even to authenticated connections. Add
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
Carl Byington <carl@five-ten-sg.com>
parents: 268
diff changeset
746 context/authenticated_dnsbl_list and context/content/authenticated.
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
Carl Byington <carl@five-ten-sg.com>
parents: 268
diff changeset
747 </para>
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
Carl Byington <carl@five-ten-sg.com>
parents: 268
diff changeset
748 <para>
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
Carl Byington <carl@five-ten-sg.com>
parents: 268
diff changeset
749 Add an optional list of domains to be enforced on the env_from value for
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
Carl Byington <carl@five-ten-sg.com>
parents: 268
diff changeset
750 authenticated connections. User abc could be restricted to envelope from
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
Carl Byington <carl@five-ten-sg.com>
parents: 268
diff changeset
751 values of a.com and b.com, user def could be restricted to envelope from
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
Carl Byington <carl@five-ten-sg.com>
parents: 268
diff changeset
752 values of dd.com and ee.com.
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
Carl Byington <carl@five-ten-sg.com>
parents: 268
diff changeset
753 </para>
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
Carl Byington <carl@five-ten-sg.com>
parents: 268
diff changeset
754 <para>
115
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
755 Look for href="hostname/path" strings that are missing the required
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
756 http:// protocol header. Such references are still clickable in common
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
757 mail software.
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
758 </para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
759 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
760
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
761 <refsect1 id='copyright.1'>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
762 <title>Copyright</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
763 <para>
261
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
764 Copyright (C) 2012 by 510 Software Group &lt;carl@five-ten-sg.com&gt;
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
765 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
766 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
767 This program is free software; you can redistribute it and/or modify it
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
768 under the terms of the GNU General Public License as published by the
160
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
769 Free Software Foundation; either version 3, or (at your option) any
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
770 later version.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
771 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
772 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
773 You should have received a copy of the GNU General Public License along
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
774 with this program; see the file COPYING. If not, please write to the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
775 Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
776 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
777 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
778
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
779 <refsect1 id='version.1'>
201
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
780 <title>Version</title>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
781 <para>
201
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
782 @VERSION@
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
783 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
784 </refsect1>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
785 </refentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
786
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
787
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
788 <refentry id="@PACKAGE@.conf.5">
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
789 <refentryinfo>
462
f3f1ece619ba change dkim_from syntax to allow "signer1,signer2;spf data"
Carl Byington <carl@five-ten-sg.com>
parents: 458
diff changeset
790 <date>2019-03-09</date>
261
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
791 <author>
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
792 <firstname>Carl</firstname>
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
793 <surname>Byington</surname>
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
794 <affiliation><orgname>510 Software Group</orgname></affiliation>
407
29d54e7028f6 document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
Carl Byington <carl@five-ten-sg.com>
parents: 397
diff changeset
795 <personblurb><para></para></personblurb>
261
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
796 </author>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
797 </refentryinfo>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
798
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
799 <refmeta>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
800 <refentrytitle>@PACKAGE@.conf</refentrytitle>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
801 <manvolnum>5</manvolnum>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
802 <refmiscinfo>@PACKAGE@ @VERSION@</refmiscinfo>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
803 </refmeta>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
804
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
805 <refnamediv id='name.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
806 <refname>@PACKAGE@.conf</refname>
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
807 <refpurpose>configuration file for @PACKAGE@ sendmail milter</refpurpose>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
808 </refnamediv>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
809
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
810 <refsynopsisdiv id='synopsis.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
811 <title>Synopsis</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
812 <cmdsynopsis>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
813 <command>@PACKAGE@.conf</command>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
814 </cmdsynopsis>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
815 </refsynopsisdiv>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
816
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
817 <refsect1 id='description.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
818 <title>Description</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
819 <para>The <command>@PACKAGE@.conf</command> configuration file is
148
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
820 specified by this partial bnf description. Comments start with //
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
821 or # and extend to the end of the line. To include the contents
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
822 of some file verbatim in the dnsbl.conf file, use
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
823 <literallayout class="monospaced"><![CDATA[include "<file>";]]></literallayout>
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
824 </para>
108
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carl
parents: 104
diff changeset
825
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
826 <literallayout class="monospaced"><![CDATA[
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
827 CONFIG = {CONTEXT ";"}+
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
828 CONTEXT = "context" NAME "{" {STATEMENT}+ "}"
321
e172dc10fe24 add dkim white/black listing
Carl Byington <carl@five-ten-sg.com>
parents: 305
diff changeset
829 STATEMENT = ( DNSBL | DNSBLLIST | DNSWL | DNSWLLIST | CONTENT | ENV-TO
e172dc10fe24 add dkim white/black listing
Carl Byington <carl@five-ten-sg.com>
parents: 305
diff changeset
830 | VERIFY | GENERIC | W_REGEX | AUTOWHITE | CONTEXT | ENV-FROM
322
9f8411f3919c add dkim white/black listing
Carl Byington <carl@five-ten-sg.com>
parents: 321
diff changeset
831 | RATE-LIMIT | REQUIRERDNS) ";"
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
832
124
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
833 DNSBL = "dnsbl" NAME DNSPREFIX ERROR-MSG1
255
d6d5c50b9278 Allow dnswl_list and dnsbl_list to be empty, to override lists specified in the ancestor contexts. Add daily recipient limits as a multiple of the hourly limits.
Carl Byington <carl@five-ten-sg.com>
parents: 253
diff changeset
834 DNSBLLIST = "dnsbl_list" {NAME}*
108
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carl
parents: 104
diff changeset
835
255
d6d5c50b9278 Allow dnswl_list and dnsbl_list to be empty, to override lists specified in the ancestor contexts. Add daily recipient limits as a multiple of the hourly limits.
Carl Byington <carl@five-ten-sg.com>
parents: 253
diff changeset
836 DNSWL = "dnswl" NAME DNSPREFIX LEVEL
d6d5c50b9278 Allow dnswl_list and dnsbl_list to be empty, to override lists specified in the ancestor contexts. Add daily recipient limits as a multiple of the hourly limits.
Carl Byington <carl@five-ten-sg.com>
parents: 253
diff changeset
837 DNSWLLIST = "dnswl_list" {NAME}*
d6d5c50b9278 Allow dnswl_list and dnsbl_list to be empty, to override lists specified in the ancestor contexts. Add daily recipient limits as a multiple of the hourly limits.
Carl Byington <carl@five-ten-sg.com>
parents: 253
diff changeset
838 LEVEL = INTEGER
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
839
268
f941563c2a95 Add require_rdns checking
Carl Byington <carl@five-ten-sg.com>
parents: 263
diff changeset
840 REQUIRERDNS = "require_rdns" ("yes" | "no")
f941563c2a95 Add require_rdns checking
Carl Byington <carl@five-ten-sg.com>
parents: 263
diff changeset
841
108
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carl
parents: 104
diff changeset
842 CONTENT = "content" ("on" | "off") "{" {CONTENT-ST}+ "}"
322
9f8411f3919c add dkim white/black listing
Carl Byington <carl@five-ten-sg.com>
parents: 321
diff changeset
843 CONTENT-ST = (FILTER | URIBL | IGNORE | TLD | HTML-TAGS | HTML-LIMIT |
9f8411f3919c add dkim white/black listing
Carl Byington <carl@five-ten-sg.com>
parents: 321
diff changeset
844 HOST-LIMIT | SPAMASS | REQUIRE | DCCGREY | DCCBULK | DKIM_SIGNER |
9f8411f3919c add dkim white/black listing
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parents: 321
diff changeset
845 DKIM_FROM) ";"
124
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
846 FILTER = "filter" DNSPREFIX ERROR-MSG2
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
847 URIBL = "uribl" DNSPREFIX ERROR-MSG3
108
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parents: 104
diff changeset
848 IGNORE = "ignore" "{" {HOSTNAME [";"]}+ "}"
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carl
parents: 104
diff changeset
849 TLD = "tld" "{" {TLD [";"]}+ "}"
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carl
parents: 104
diff changeset
850 HTML-TAGS = "html_tags" "{" {HTMLTAG [";"]}+ "}"
124
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
851 ERROR-MSG1 = string containing exactly two %s replacement tokens
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
852 both are replaced with the client ip address
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
853 ERROR-MSG2 = string containing exactly two %s replacement tokens
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
854 the first is replaced with the hostname, and the second
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
855 is replaced with the ip address
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
856 ERROR-MSG3 = string containing exactly two %s replacement tokens
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
857 both are replaced with the hostname
108
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parents: 104
diff changeset
858
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
859 HTML-LIMIT = "html_limit" ("on" INTEGER ERROR-MSG | "off")
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carl
parents: 104
diff changeset
860
111
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parents: 108
diff changeset
861 HOST-LIMIT = "host_limit" ("on" INTEGER ERROR-MSG | "off" |
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carl
parents: 108
diff changeset
862 "soft" INTEGER)
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
863 SPAMASS = "spamassassin" INTEGER
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
864 REQUIRE = "require_match" ("yes" | "no")
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
865 DCCGREY = "dcc_greylist" ("yes" | "no")
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
866 DCCBULK = "dcc_bulk_threshold" (INTEGER | "many" | "off")
94
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carl
parents: 92
diff changeset
867
321
e172dc10fe24 add dkim white/black listing
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parents: 305
diff changeset
868 DKIMSIGNER = "dkim_signer" "{" {SIGNING_DOMAIN DEF [";"]}+ "}"
360
17f21fcd44a8 allow quoted comma separated multiple signers in the dkim_from config entries
Carl Byington <carl@five-ten-sg.com>
parents: 322
diff changeset
869 DKIMFROM = "dkim_from" "{" {HEADER_FROM_DOMAIN DKIMVALUE SIGNERS [";"]}+ "}"
451
f2bc221240e8 add unsigned_black for enforcement of dmarc policy
Carl Byington <carl@five-ten-sg.com>
parents: 436
diff changeset
870 DKIMVALUE = "signed_white" | "signed_black" | "require_signed" | "unsigned_black"
462
f3f1ece619ba change dkim_from syntax to allow "signer1,signer2;spf data"
Carl Byington <carl@five-ten-sg.com>
parents: 458
diff changeset
871 SIGNERS = '"' SIGNING_DOMAINS[;EXTRA_SPF_DATA] '"'
f3f1ece619ba change dkim_from syntax to allow "signer1,signer2;spf data"
Carl Byington <carl@five-ten-sg.com>
parents: 458
diff changeset
872 SIGNING_DOMAINS = SIGNING_DOMAIN[,SIGNING_DOMAINS]
321
e172dc10fe24 add dkim white/black listing
Carl Byington <carl@five-ten-sg.com>
parents: 305
diff changeset
873
108
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carl
parents: 104
diff changeset
874 ENV-TO = "env_to" "{" {(TO-ADDR | DCC-TO)}+ "}"
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carl
parents: 104
diff changeset
875 TO-ADDR = ADDRESS [";"]
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
876 DCC-TO = "dcc_to" ("ok" | "many") "{" DCCINCLUDEFILE "}" ";"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
877
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
878 VERIFY = "verify" HOSTNAME ";"
168
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
879 GENERIC = "generic" REGULAREXPRESSION ERROR-MSG4 ";"
233
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
880 W-REGEX = "white_regex" REGULAREXPRESSION ";"
168
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
881 ERROR-MSG4 = string containing exactly one %s replacement token
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
882 which is replaced with the client name
153
8d7c439bb6fa add auto whitelisting
carl
parents: 152
diff changeset
883 AUTOWHITE = "autowhite" DAYS FILENAME ";"
108
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carl
parents: 104
diff changeset
884
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
885 ENV_FROM = "env_from" [DEFAULT] "{" {(FROM-ADDR | DCC-FROM)}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
886 FROM-ADDR = ADDRESS VALUE [";"]
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
887 DCC-FROM = "dcc_from" "{" DCCINCLUDEFILE "}" ";"
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
888
278
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
889 RATE-LIMIT = "rate_limit" DEFAULT_RCPT_LIMIT DAILY_MULTIPLE_RCPT
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
890 DEFAULT_IP_LIMIT DAILY_MULTIPLE_IP "{" (RATE)+ "}"
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
891 RATE = USER RCPTLIMIT IPLIMIT ";"
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
892 RCPTLIMIT = INTEGER
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
893 DEFAULT_RCPT_LIMIT = INTEGER
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
894 DAILY_MULTIPLE_RCPT = INTEGER
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
895 DEFAULT_IP_LIMIT = INTEGER
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
896 DAILY_MULTIPLE_IP = INTEGER
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
897
360
17f21fcd44a8 allow quoted comma separated multiple signers in the dkim_from config entries
Carl Byington <carl@five-ten-sg.com>
parents: 322
diff changeset
898 DEF = ("white" | "black" | "unknown")
17f21fcd44a8 allow quoted comma separated multiple signers in the dkim_from config entries
Carl Byington <carl@five-ten-sg.com>
parents: 322
diff changeset
899 DEFAULT = (DEF | "inherit" | "")
108
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carl
parents: 104
diff changeset
900 ADDRESS = (USER@ | DOMAIN | USER@DOMAIN)
360
17f21fcd44a8 allow quoted comma separated multiple signers in the dkim_from config entries
Carl Byington <carl@five-ten-sg.com>
parents: 322
diff changeset
901 VALUE = (DEF | "inherit" | CHILD-CONTEXT-NAME)]]></literallayout>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
902 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
903
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
904 <refsect1 id='sample.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
905 <title>Sample</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
906 <literallayout class="monospaced"><![CDATA[
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
907 context main-default {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
908 // outbound dnsbl filtering to catch our own customers that end up on the sbl
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
909 dnsbl sbl sbl-xbl.spamhaus.org "Mail from %s rejected - sbl; see http://www.spamhaus.org/query/bl?ip=%s";
174
da0c41b9f672 don't whitelist addresses with embedded spaces
carl
parents: 172
diff changeset
910 dnsbl_list sbl;
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
911
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
912 // outbound content filtering to prevent our own customers from sending spam
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
913 content on {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
914 filter sbl-xbl.spamhaus.org "Mail containing %s rejected - sbl; see http://www.spamhaus.org/query/bl?ip=%s";
270
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
Carl Byington <carl@five-ten-sg.com>
parents: 268
diff changeset
915 uribl multi.surbl.org "Mail containing %s rejected - surbl; see http://www.surbl.org/surbl-analysis?d=%s";
259
be939802c64e add recipient rate limits by email from address or domain
Carl Byington <carl@five-ten-sg.com>
parents: 255
diff changeset
916 #uribl multi.uribl.com "Mail containing %s rejected - uribl; see http://l.uribl.com/?d=%s";
270
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
Carl Byington <carl@five-ten-sg.com>
parents: 268
diff changeset
917 #uribl dbl.spamhaus.org "Mail containing %s rejected - dbl; see http://www.spamhaus.org/query/domain?domain=%s";
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
918 ignore { include "hosts-ignore.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
919 tld { include "tld.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
920 html_tags { include "html-tags.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
921 html_limit on 20 "Mail containing excessive bad html tags rejected";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
922 html_limit off;
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
923 host_limit on 20 "Mail containing excessive host names rejected";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
924 host_limit soft 20;
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
925 spamassassin 4;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
926 require_match yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
927 dcc_greylist yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
928 dcc_bulk_threshold 50;
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
929 };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
930
278
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
931 // backscatter prevention - do not send bounces for mail that we accepted but could not forward
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
932 // we only send bounces to our own customers
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
933 env_from unknown {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
934 "<>" black;
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
935 };
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
936
278
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
937 // hourly recipient rate limit by smtp auth client id, or unauthenticated mail from address
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
938 // hourly unique ip addresses by smtp auth client id, or unauthenticated mail from address
284
896b9393d3f0 Fix segfault caused by freeing unallocated memory
Carl Byington <carl@five-ten-sg.com>
parents: 278
diff changeset
939 // default hourly recipient rate limit is 30
896b9393d3f0 Fix segfault caused by freeing unallocated memory
Carl Byington <carl@five-ten-sg.com>
parents: 278
diff changeset
940 // daily recipient rate limits are 4 times the hourly limit
278
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
941 // default hourly unique ip addresses is 5
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
942 // daily unique ip addresses are 4 times the hourly limit
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
943 rate_limit 30 4 5 4 { // default
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
944 fred 100 10; // override default limits
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
945 joe 10 2; // ""
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
946 "sam@somedomain.tld" 500 2;
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
947 "@otherdomain.tld" 100 2;
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
948 };
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
949 };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
950
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
951 context main {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
952 dnsbl localp partial.blackholes.five-ten-sg.com "Mail from %s rejected - local; see http://www.five-ten-sg.com/blackhole.php?%s";
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
953 dnsbl local blackholes.five-ten-sg.com "Mail from %s rejected - local; see http://www.five-ten-sg.com/blackhole.php?%s";
174
da0c41b9f672 don't whitelist addresses with embedded spaces
carl
parents: 172
diff changeset
954 dnsbl sbl zen.spamhaus.org "Mail from %s rejected - sbl; see http://www.spamhaus.org/query/bl?ip=%s";
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
955 dnsbl xbl xbl.spamhaus.org "Mail from %s rejected - xbl; see http://www.spamhaus.org/query/bl?ip=%s";
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
956 dnswl dnswl.org list.dnswl.org 2;
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
957 dnsbl_list local sbl;
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
958 dnswl_list dnswl.org;
268
f941563c2a95 Add require_rdns checking
Carl Byington <carl@five-ten-sg.com>
parents: 263
diff changeset
959 require_rdns yes;
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
960
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
961 content on {
360
17f21fcd44a8 allow quoted comma separated multiple signers in the dkim_from config entries
Carl Byington <carl@five-ten-sg.com>
parents: 322
diff changeset
962 dkim_signer {
395
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
963 #
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
964 # anything signed by this is accepted.
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
965 accounts.google.com white;
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
966 };
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
967 dkim_from {
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
968 #
458
6c1c2bd9fb54 ignore dnswl entries if the sender is <>
Carl Byington <carl@five-ten-sg.com>
parents: 451
diff changeset
969 # dmarc enforcement
6c1c2bd9fb54 ignore dnswl entries if the sender is <>
Carl Byington <carl@five-ten-sg.com>
parents: 451
diff changeset
970 aim.com unsigned_black "aim.com,mx.aim.com";
6c1c2bd9fb54 ignore dnswl entries if the sender is <>
Carl Byington <carl@five-ten-sg.com>
parents: 451
diff changeset
971 aol.com unsigned_black "aol.com,mx.aol.com";
6c1c2bd9fb54 ignore dnswl entries if the sender is <>
Carl Byington <carl@five-ten-sg.com>
parents: 451
diff changeset
972 yahoo.co.uk unsigned_black yahoo.co.uk;
6c1c2bd9fb54 ignore dnswl entries if the sender is <>
Carl Byington <carl@five-ten-sg.com>
parents: 451
diff changeset
973 yahoo.com unsigned_black yahoo.com;
6c1c2bd9fb54 ignore dnswl entries if the sender is <>
Carl Byington <carl@five-ten-sg.com>
parents: 451
diff changeset
974 yahoo.in unsigned_black yahoo.in;
6c1c2bd9fb54 ignore dnswl entries if the sender is <>
Carl Byington <carl@five-ten-sg.com>
parents: 451
diff changeset
975 #
395
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
976 # white/blacklisting based on presence of valid signatures
360
17f21fcd44a8 allow quoted comma separated multiple signers in the dkim_from config entries
Carl Byington <carl@five-ten-sg.com>
parents: 322
diff changeset
977 credit.paypal.com require_signed credit.paypal.com;
17f21fcd44a8 allow quoted comma separated multiple signers in the dkim_from config entries
Carl Byington <carl@five-ten-sg.com>
parents: 322
diff changeset
978 paypal.com require_signed paypal.com;
17f21fcd44a8 allow quoted comma separated multiple signers in the dkim_from config entries
Carl Byington <carl@five-ten-sg.com>
parents: 322
diff changeset
979 dhl.com require_signed dhl.com;
17f21fcd44a8 allow quoted comma separated multiple signers in the dkim_from config entries
Carl Byington <carl@five-ten-sg.com>
parents: 322
diff changeset
980 adp.com require_signed "adp.com,bmi.adp.com";
395
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
981 #
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
982 # blacklisting based on header from value - requiring signatures
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
983 # from an impossible signer.
409
e018ed19a1cc require 3 dots in bare ip addresses
Carl Byington <carl@five-ten-sg.com>
parents: 407
diff changeset
984 spammer.domain require_signed .;
395
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
985 #
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
986 # whitelisting based on strong spf pass - whitelisted if signed by
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
987 # an impossible signer (which will never happen) or strong spf pass.
409
e018ed19a1cc require 3 dots in bare ip addresses
Carl Byington <carl@five-ten-sg.com>
parents: 407
diff changeset
988 some.domain signed_white .;
395
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
989 #
462
f3f1ece619ba change dkim_from syntax to allow "signer1,signer2;spf data"
Carl Byington <carl@five-ten-sg.com>
parents: 458
diff changeset
990 # whitelisting based on strong spf pass - whitelisted if signed by
f3f1ece619ba change dkim_from syntax to allow "signer1,signer2;spf data"
Carl Byington <carl@five-ten-sg.com>
parents: 458
diff changeset
991 # an impossible signer (which will never happen) or strong spf pass
f3f1ece619ba change dkim_from syntax to allow "signer1,signer2;spf data"
Carl Byington <carl@five-ten-sg.com>
parents: 458
diff changeset
992 # adding some extra spf data to their record. This whitelists their
f3f1ece619ba change dkim_from syntax to allow "signer1,signer2;spf data"
Carl Byington <carl@five-ten-sg.com>
parents: 458
diff changeset
993 # email that arrives via 10.0.0.0/16 (or via anything listed in their
f3f1ece619ba change dkim_from syntax to allow "signer1,signer2;spf data"
Carl Byington <carl@five-ten-sg.com>
parents: 458
diff changeset
994 # actual spf record).
f3f1ece619ba change dkim_from syntax to allow "signer1,signer2;spf data"
Carl Byington <carl@five-ten-sg.com>
parents: 458
diff changeset
995 some.other.domain signed_white ".;ip4:10.0.0.0/16";
f3f1ece619ba change dkim_from syntax to allow "signer1,signer2;spf data"
Carl Byington <carl@five-ten-sg.com>
parents: 458
diff changeset
996 #
395
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
997 # whitelisting based on valid signature or strong spf pass.
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
998 # some paychex mail is signed, some is unsigned but passes strong spf.
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
999 paychex.com require_signed paychex.com;
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
1000 #
414
d5a1ed33d3ae spf code now handles mx,exists,ptr tags, multiple A records, %{i} macro
Carl Byington <carl@five-ten-sg.com>
parents: 409
diff changeset
1001 # whitelisting from mailchimp which needs wildcards
d5a1ed33d3ae spf code now handles mx,exists,ptr tags, multiple A records, %{i} macro
Carl Byington <carl@five-ten-sg.com>
parents: 409
diff changeset
1002 princetheater.org require_signed "mandrillapp.com,*.mcsignup.com,*.mcsv.net,*.rsgsv.net,*.mcdlv.net";
d5a1ed33d3ae spf code now handles mx,exists,ptr tags, multiple A records, %{i} macro
Carl Byington <carl@five-ten-sg.com>
parents: 409
diff changeset
1003 #
360
17f21fcd44a8 allow quoted comma separated multiple signers in the dkim_from config entries
Carl Byington <carl@five-ten-sg.com>
parents: 322
diff changeset
1004 };
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
1005 filter sbl-xbl.spamhaus.org "Mail containing %s rejected - sbl; see http://www.spamhaus.org/query/bl?ip=%s";
270
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
Carl Byington <carl@five-ten-sg.com>
parents: 268
diff changeset
1006 uribl multi.surbl.org "Mail containing %s rejected - surbl; see http://www.surbl.org/surbl-analysis?d=%s";
259
be939802c64e add recipient rate limits by email from address or domain
Carl Byington <carl@five-ten-sg.com>
parents: 255
diff changeset
1007 #uribl multi.uribl.com "Mail containing %s rejected - uribl; see http://l.uribl.com/?d=%s";
270
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
Carl Byington <carl@five-ten-sg.com>
parents: 268
diff changeset
1008 #uribl dbl.spamhaus.org "Mail containing %s rejected - dbl; see http://www.spamhaus.org/query/domain?domain=%s";
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
1009 ignore { include "hosts-ignore.conf"; };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
1010 tld { include "tld.conf"; };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
1011 html_tags { include "html-tags.conf"; };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
1012 html_limit off;
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
1013 host_limit soft 20;
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
1014 spamassassin 5;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
1015 require_match yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
1016 dcc_greylist yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
1017 dcc_bulk_threshold 20;
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
1018 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
1019
216
784030ac71f1 Never whitelist self addressed mail. Changes for Fedora 10 and const correctness.
Carl Byington <carl@five-ten-sg.com>
parents: 214
diff changeset
1020 generic "^dsl.static.*ttnet.net.tr$|(^|[x.-])(ppp|h|host)?([0-9]{1,3}[x.-](Red-|dynamic[x.-])?){4}"
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
1021 "your mail server %s seems to have a generic name";
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
1022
259
be939802c64e add recipient rate limits by email from address or domain
Carl Byington <carl@five-ten-sg.com>
parents: 255
diff changeset
1023 white_regex "=example.com=user@yourhostingaccount.com$";
233
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
1024
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
1025 env_to {
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
1026 # !! replace this with your domain names
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
1027 # child contexts are not allowed to specify recipient addresses outside these domains
179
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
1028 # if this is a backup-mx, you need to include here domains for which you relay to the primary mx
174
da0c41b9f672 don't whitelist addresses with embedded spaces
carl
parents: 172
diff changeset
1029 include "/etc/mail/local-host-names";
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
1030 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
1031
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
1032 context whitelist {
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
1033 content off {};
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
1034 env_to {
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
1035 # dcc_to ok { include "/var/dcc/whitecommon"; };
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
1036 };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
1037 env_from white {}; # white forces all unmatched from addresses (everyone in this case) to be whitelisted
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
1038 # so all mail TO these env_to addresses is accepted
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
1039 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
1040
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
1041 context abuse {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
1042 dnsbl_list xbl;
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
1043 content off {};
174
da0c41b9f672 don't whitelist addresses with embedded spaces
carl
parents: 172
diff changeset
1044 generic "^$ " " "; # regex cannot match, to disable generic rdns rejects
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
1045 env_to {
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1046 abuse@ # no content filtering on abuse reports
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1047 postmaster@ # ""
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1048 };
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1049 env_from unknown {}; # ignore all parent white/black listing
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1050 };
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1051
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1052 context minimal {
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1053 dnsbl_list sbl;
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1054 content on {
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1055 spamassassin 10;
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1056 dcc_bulk_threshold many;
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1057 };
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1058 generic "^$ " " "; # regex cannot match, to disable generic rdns rejects
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1059 env_to {
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1060 };
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1061 };
94
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1062
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1063 context blacklist {
255
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1064 dnsbl_list ;
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1065 dnswl_list ;
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1066 env_to {
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1067 # dcc_to many { include "/var/dcc/whitecommon"; };
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1068 };
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1069 env_from black {}; # black forces all unmatched from addresses (everyone in this case) to be blacklisted
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1070 # so all mail TO these env_to addresses is rejected
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1071 };
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1072
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1073 env_from unknown {
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1074 abuse@ abuse; # replies to abuse reports use the abuse context
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1075 # dcc_from { include "/var/dcc/whitecommon"; };
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1076 };
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1077
171
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1078 autowhite 90 "autowhite/my-auto-whitelist";
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1079 # install should create /etc/dnsbl/autowhite writable by userid dnsbl
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1080 };]]></literallayout>
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1081 </refsect1>
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1082
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1083 <refsect1 id='version.5'>
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1084 <title>Version</title>
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1085 <para>
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1086 @VERSION@
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1087 </para>
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1088 </refsect1>
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1089
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1090 </refentry>
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1091 </reference>