annotate xml/dnsbl.in @ 395:a8cf6a3da907 stable-6-0-52

document dkim/spf processing
author Carl Byington <carl@five-ten-sg.com>
date Tue, 07 Mar 2017 09:39:25 -0800
parents 17f21fcd44a8
children d08da4b058e8
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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>2017-03-07</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 </author>
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34 </refentryinfo>
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35
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36 <refmeta>
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37 <refentrytitle>@PACKAGE@</refentrytitle>
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38 <manvolnum>1</manvolnum>
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39 <refmiscinfo>@PACKAGE@ @VERSION@</refmiscinfo>
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40 </refmeta>
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41
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42 <refnamediv id='name.1'>
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43 <refname>@PACKAGE@</refname>
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44 <refpurpose>a sendmail milter with per-user dnsbl filtering</refpurpose>
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45 </refnamediv>
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46
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47 <refsynopsisdiv id='synopsis.1'>
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48 <title>Synopsis</title>
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49 <cmdsynopsis>
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50 <command>@PACKAGE@</command>
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51 <arg><option>-c</option></arg>
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52 <arg><option>-s</option></arg>
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53 <arg><option>-d <replaceable class="parameter">n</replaceable></option></arg>
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54 <arg><option>-e <replaceable class="parameter">from|to</replaceable></option></arg>
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55 <arg><option>-b <replaceable class="parameter">local-domain-socket</replaceable></option></arg>
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56 <arg><option>-r <replaceable class="parameter">local-domain-socket</replaceable></option></arg>
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57 <arg><option>-p <replaceable class="parameter">sendmail-socket</replaceable></option></arg>
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58 <arg><option>-t <replaceable class="parameter">timeout</replaceable></option></arg>
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59 </cmdsynopsis>
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60 </refsynopsisdiv>
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61
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62 <refsect1 id='options.1'>
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63 <title>Options</title>
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64 <variablelist>
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65 <varlistentry>
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66 <term>-c</term>
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67 <listitem><para>
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68 Load the configuration file, print a cannonical form
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69 of the configuration on stdout, and exit.
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70 </para></listitem>
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71 </varlistentry>
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72 <varlistentry>
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73 <term>-s</term>
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74 <listitem><para>
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75 Stress test the configuration loading code by repeating
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76 the load/free cycle in an infinite loop.
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77 </para></listitem>
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78 </varlistentry>
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79 <varlistentry>
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80 <term>-d <replaceable class="parameter">n</replaceable></term>
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81 <listitem><para>
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82 Set the debug level to <replaceable class="parameter">n</replaceable>.
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83 </para></listitem>
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84 </varlistentry>
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85 <varlistentry>
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86 <term>-e <replaceable class="parameter">from|to</replaceable></term>
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87 <listitem><para>
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88 Print the results of looking up the from and to addresses in the
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89 current configuration. The | character is used to separate the from and to
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90 addresses in the argument to the -e switch.
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91 </para></listitem>
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92 </varlistentry>
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93 <varlistentry>
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94 <term>-b <replaceable class="parameter">local-domain-socket-file-name</replaceable></term>
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95 <listitem><para>
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96 Set the local socket used for the connection to the dccifd daemon.
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97 This is typically /var/dcc/dccifd.
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98 </para></listitem>
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99 </varlistentry>
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100 <varlistentry>
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101 <term>-r <replaceable class="parameter">local-domain-socket-file-name</replaceable></term>
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102 <listitem><para>
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103 Set the local socket used for the connection to our own dns resolver processes.
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104 </para></listitem>
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105 </varlistentry>
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106 <varlistentry>
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107 <term>-p <replaceable class="parameter">sendmail-socket</replaceable></term>
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108 <listitem><para>
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109 Set the socket used for the milter connection to sendmail. This is either
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110 "inet:port@ip-address" or "local:local-domain-socket-file-name".
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111 </para></listitem>
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112 </varlistentry>
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113 <varlistentry>
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114 <term>-t <replaceable class="parameter">timeout</replaceable></term>
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115 <listitem><para>
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116 Set the timeout in seconds used for communication with sendmail.
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117 </para></listitem>
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118 </varlistentry>
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119 </variablelist>
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120 </refsect1>
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121
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122 <refsect1 id='usage.1'>
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123 <title>Usage</title>
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124 <para><command>@PACKAGE@</command> -c</para>
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125 <para><command>@PACKAGE@</command> -s</para>
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126 <para><command>@PACKAGE@</command> -e 'someone@aol.com|localname@mydomain.tld'</para>
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127 <para><command>@PACKAGE@</command> -d 10 -r resolver.sock -p local:dnsbl.sock</para>
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128 </refsect1>
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129
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130 <refsect1 id='installation.1'>
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131 <title>Installation</title>
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132 <para>
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133 This is now a standard GNU autoconf/automake installation, so the normal
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134 "./configure; make; su; make install" works. "make chkconfig" will
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135 setup the init.d runlevel scripts. Alternatively, you can use the
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136 source or binary RPMs at <ulink
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137 url="http://www.five-ten-sg.com/@PACKAGE@/packages">http://www.five-ten-sg.com/@PACKAGE@/packages</ulink>.
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138 </para>
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139 <para>
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140 Note that this has ONLY been tested on Linux, specifically RedHat Linux.
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141 In particular, this milter makes no attempt to understand IPv6. Your
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142 mileage will vary. You will need at a minimum a C++ compiler with a
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143 minimally thread safe STL implementation. The distribution includes a
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144 test.cpp program. If it fails this milter won't work. If it passes,
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145 this milter might work.
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146 </para>
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147 <para>
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148 Modify your sendmail.mc by removing all the "FEATURE(dnsbl" lines, add
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149 the following line in your sendmail.mc and rebuild the .cf file
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150 </para>
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151 <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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152 <para>
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153 Modify the default <citerefentry>
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154 <refentrytitle>@PACKAGE@.conf</refentrytitle> <manvolnum>5</manvolnum>
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155 </citerefentry> configuration.
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156 </para>
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157 </refsect1>
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158
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159 <refsect1 id='configuration.1'>
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160 <title>Configuration</title>
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161 <para>
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162 The configuration file is documented in <citerefentry>
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163 <refentrytitle>@PACKAGE@.conf</refentrytitle> <manvolnum>5</manvolnum>
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164 </citerefentry>. Any change to the config file, or any file included
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165 from that config file, will cause it to be reloaded within three
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166 minutes.
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167 </para>
108
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168 </refsect1>
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169
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170 <refsect1 id='introduction.1'>
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171 <title>Introduction</title>
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172 <para>
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173 Consider the case of a mail server that is acting as secondary MX for a
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174 collection of clients, each of which has a collection of mail domains.
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175 Each client may use their own collection of DNSBLs on their primary mail
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176 server. We present here a mechanism whereby the backup mail server can
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177 use the correct set of DNSBLs for each recipient for each message. As a
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178 side-effect, it gives us the ability to customize the set of DNSBLs on a
183
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179 per-recipient basis, so that fred@example.com could use LOCAL and the
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180 SBL, where all other users @example.com use only the SBL.
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181 </para>
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182 <para>
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183 This milter can also verify the envelope from/recipient pairs with the
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184 primary MX server. This allows the backup mail servers to properly
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185 reject mail sent to invalid addresses. Otherwise, the backup mail
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186 servers will accept that mail, and then generate a bounce message when
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187 the message is forwarded to the primary server (and rejected there with
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188 no such user). These rejections are the primary cause of such backscatter.
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189 </para>
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190 <para>
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191 This milter will also decode (uuencode, base64, mime, html entity, url
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192 encodings) and scan for HTTP and HTTPS URLs and bare hostnames in the
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193 body of the mail. If any of those host names have A or NS records on
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194 the SBL (or a single configurable DNSBL), the mail will be rejected
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195 unless previously whitelisted. This milter also counts the number of
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196 invalid HTML tags, and can reject mail if that count exceeds your
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197 specified limit.
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198 </para>
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199 <para>
259
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200 This milter can also impose hourly and daily rate
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201 limits on the number of recipients accepted from SMTP
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202 AUTH connections, that would otherwise be allowed to
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203 relay thru this mail server with no spam filtering. If
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204 the connection does not use SMTP AUTH, the rate limits
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205 may be specified by the mail from email address or
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206 domain.
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207 </para>
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208 <para>
284
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209 This milter can also impose hourly and daily limits on the number of
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210 different ip addresses used for SMTP AUTH connections. If a single
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211 user is connecting from too many different ip addresses, we presume that
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212 their authentication credentials have been discovered, and block their
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213 outgoing mail.
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214 </para>
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215 <para>
162
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216 Consider the case of a message from A to B passing thru this milter. If
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217 that message is not blocked, then we might eventually see a reply
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218 message from B to A. If the filtering context for A includes an
162
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219 autowhite entry, and that context does <emphasis>not</emphasis> cover B
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220 as a recipient, then this milter will add an entry in that file to
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221 whitelist such replies for a configurable time period. Suppose A and B
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222 are in the same domain, or at least use the same filtering context. In
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223 that case we don't want to add a whitelist entry for B, since that would
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224 then allow spammers to send mail from B (forged) to B. Such autowhite
160
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225 files need to be writeable by the dnsbl user, where all the other dnsbl
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226 configuration files only need to be readable by the dnsbl user.
156
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227 </para>
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228 <para>
176
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229 You can manually add such an autowhite entry, by appending a single
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230 text line to the autowhitelist file, using something like
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231 <command>echo "$mail 0" >>$autowhitefile</command>.
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232 You can manually remove such an autowhite entry, by appending a single
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233 text line to the autowhitelist file, using something like
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234 <command>echo "$mail 1" >>$autowhitefile</command>.
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235 </para>
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236 <para>
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237 The DNSBL milter reads a text configuration file (dnsbl.conf) on
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238 startup, and whenever the config file (or any of the referenced include
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239 files) is changed. The entire configuration file is case insensitive.
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240 If the configuration cannot be loaded due to a syntax error, the milter
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241 will log the error and quit. If the configuration cannot be reloaded
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242 after being modified, the milter will log the error and send an email to
152
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243 root from dnsbl@$hostname. You probably want to add dnsbl@$hostname
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244 to your /etc/mail/virtusertable since otherwise sendmail will reject
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245 that message.
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246 </para>
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247 </refsect1>
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248
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249 <refsect1 id='dcc.1'>
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250 <title>DCC Issues</title>
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251 <para>
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252 If you are also using the <ulink
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253 url="http://www.rhyolite.com/anti-spam/dcc/">DCC</ulink> milter, there
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254 are a few considerations. You may need to whitelist senders from the
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255 DCC bulk detector, or from the DNS based lists. Those are two very
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256 different reasons for whitelisting. The former is done thru the DCC
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257 whiteclnt config file, the later is done thru the DNSBL milter config
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258 file.
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259 </para>
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260 <para>
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261 You may want to blacklist some specific senders or sending domains.
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262 This could be done thru either the DCC (on a global basis, or for a
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263 specific single recipient). We prefer to do such blacklisting via the
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264 DNSBL milter config, since it can be done for a collection of recipient
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265 mail domains. The DCC approach has the feature that you can capture the
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266 entire message in the DCC log files. The DNSBL milter approach has the
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267 feature that the mail is rejected earlier (at RCPT TO time), and the
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268 sending machine just gets a generic "550 5.7.1 no such user" message.
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269 </para>
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270 <para>
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271 The DCC whiteclnt file can be included in the DNSBL milter config by the
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272 dcc_to and dcc_from statements. This will import the (env_to, env_from,
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273 and substitute mail_host) entries from the DCC config into the DNSBL
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274 config. This allows using the DCC config as the single point for
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275 white/blacklisting.
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276 </para>
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277 <para>
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278 Consider the case where you have multiple clients, each with their own
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279 mail servers, and each running their own DCC milters. Each client is
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280 using the DCC facilities for envelope from/to white/blacklisting.
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281 Presumably you can use rsync or scp to fetch copies of your clients DCC
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282 whiteclnt files on a regular basis. Your mail server, acting as a
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283 backup MX for your clients, can use the DNSBL milter, and include those
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284 client DCC config files. The envelope from/to white/blacklisting will
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285 be appropriately tagged and used only for the domains controlled by each
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286 of those clients.
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287 </para>
179
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288 <para>
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289 You can now use (via dccifd) different dcc filtering parameters on a per
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290 context basis. See the dcc_greylist and dcc_bulk_threshold statements
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291 in the <citerefentry> <refentrytitle>@PACKAGE@.conf</refentrytitle>
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292 <manvolnum>5</manvolnum> </citerefentry> configuration. Those
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293 statements are only active if you supply the <option>-b</option> option
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294 on the dnsbl command line. If you use the dcc via the standard dcc
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295 milter (dccm), then connections from clients that use SMTP AUTH are
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296 still subject to greylisting. If you use the dcc via dccifd and this
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297 milter, then connections from clients that use SMTP AUTH are never
180
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298 subject to greylisting. As part of this per-user greylisting, you need
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299 to move the dnsblnogrey file from the config directory to something
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300 like /var/dcc/userdirs/local/dnsblnogrey/whiteclnt so the dccifd will
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301 properly ignore greylisting for those recipients that don't want it.
179
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302 </para>
108
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303 </refsect1>
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304
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305 <refsect1 id='definitions.1'>
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306 <title>Definitions</title>
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307 <para>
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308 CONTEXT - a collection of parameters that defines the filtering context
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309 to be used for a collection of envelope recipient addresses. The
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310 context includes such things as the list of DNSBLs to be used, and the
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311 various content filtering parameters.
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312 </para>
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313 <para>
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314 DNSBL - a named DNS based blocking list is defined by a dns suffix (e.g.
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315 sbl-xbl.spamhaus.org) and a message string that is used to generate the
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316 "550 5.7.1" smtp error return code. The names of these DNSBLs will be
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317 used to define the DNSBL-LISTs.
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318 </para>
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319 <para>
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320 DNSBL-LIST - a named list of DNSBLs that will be used for specific
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321 recipients or recipient domains.
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322 </para>
249
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323 <para>
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324 DNSWL - a named DNS based white list is defined by a dns suffix (e.g.
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diff changeset
325 list.dnswl.org) and an integer level. If the level is greater than or
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326 equal to x in the 127.0.z.x return code from the white list, then the
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327 ip address is considered to match, and the message will be whitelisted.
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328 The names of these DNSWLs will be used to define the DNSWL-LISTs.
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329 </para>
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330 <para>
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331 DNSWL-LIST - a named list of DNSWLs that will be used for specific
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332 recipients or recipient domains.
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333 </para>
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334 </refsect1>
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335
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336 <refsect1 id='filtering.1'>
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337 <title>Filtering Procedure</title>
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338 <para>
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339 The SMTP envelope 'from' and 'to' values are used in various checks.
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340 The first check is to see if a reply message (swapping the env_from and
160
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341 env_to values) would be unconditionally blocked (just based on the
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342 envelope from address). That check is similar to the main check
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343 described below, but there is no body content to be scanned, and there
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344 is no client connection ip address to be checked against DNSBLs. If
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345 such a reply message would be blocked, we also block the original
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346 outgoing message. This prevents folks from sending mail to recipients
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347 that are unable to reply.
152
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348 </para>
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349 <para>
284
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350 If the client has authenticated with sendmail, the recipient rate limits
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351 and connection ip address limits are
268
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352 checked. If the authenticated user has not exceeded the hourly or daily rate
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353 limits, then the mail is accepted, the filtering contexts are not used,
284
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354 the dns lists are not checked, and the body content is not scanned. These
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355 rate limits can also be applied to unauthenticated connections, in which case
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356 the envelope from value is used as the authentication id for lookup purposes.
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357 If
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358 the client has not authenticated with sendmail, we follow these steps
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359 for each recipient.
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360 </para>
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361 <orderedlist>
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362 <listitem><para>
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363 The envelope to email address is used to find an initial filtering
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364 context. We first look for a context that specified the full email
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365 address in the env_to statement. If that is not found, we look for a
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366 context that specified the entire domain name of the envelope recipient
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367 in the env_to statement. If that is not found, we look for a context
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368 that specified the user@ part of the envelope recipient in the env_to
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369 statement. If that is not found, we use the first top level context
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370 defined in the config file.
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371 </para></listitem>
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372 <listitem><para>
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373 The initial filtering context may redirect to a child context based on
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374 the values in the initial context's env_from statement. We look for [1)
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375 the full envelope from email address, 2) the domain name part of the
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376 envelope from address, 3) the user@ part of the envelope from address]
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377 in that context's env_from statement, with values that point to a child
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378 context. If such an entry is found, we switch to that child filtering
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379 context.
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380 </para></listitem>
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381 <listitem><para>
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382 We lookup [1) the full envelope from email address, 2) the domain name
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383 part of the envelope from address, 3) the user@ part of the envelope
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384 from address] in the filtering context env_from statement. That results
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385 in one of (white, black, unknown, inherit).
111
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386 </para></listitem>
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387 <listitem><para>
108
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388 If the answer is black, mail to this recipient is rejected with "no such
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389 user", and the dns lists are not checked.
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390 </para></listitem>
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391 <listitem><para>
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392 If the answer is white, mail to this recipient is accepted and the dns
395
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393 lists are not checked. However, if the envelope from domain name is
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394 listed in the current filtering context (or parents) dkim_from with
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395 "required_signed",
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396 we downgrade this to white answer to unknown.
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397 </para></listitem>
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398 <listitem><para>
108
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399 If the answer is unknown, we don't reject yet, but the dns lists will be
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400 checked, and the content may be scanned.
111
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401 </para></listitem>
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402 <listitem><para>
108
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403 If the answer is inherit, we repeat the envelope from search in the
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404 parent context.
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405 </para></listitem>
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406 <listitem><para>
233
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parents: 216
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407 If the mail has not been accepted or rejected yet, and the filtering
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
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408 context (or any ancestor context) specifies a non-empty whitelist regular
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parents: 216
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409 expression, then we check the envelope from value against that regex.
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parents: 216
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410 The mail is accepted if the envelope from value matches the specified regular
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411 expression.
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parents: 216
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412 </para></listitem>
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parents: 216
diff changeset
413 <listitem><para>
249
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diff changeset
414 If the mail has not been accepted or rejected yet, the dns white lists
15bf4f68a0b2 Add dnswl support
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parents: 246
diff changeset
415 specified in the filtering context are checked and the mail is accepted
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parents: 246
diff changeset
416 if any list has an A record for the standard dns based lookup scheme
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diff changeset
417 (reversed octets of the client followed by the dns suffix) with a final
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418 octet greater than or equal to the level specified for that dnswl.
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parents: 246
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419 </para></listitem>
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parents: 246
diff changeset
420 <listitem><para>
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diff changeset
421 If the mail has not been accepted or rejected yet, the dns black lists
168
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parents: 167
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422 specified in the filtering context are checked and the mail is rejected
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parents: 167
diff changeset
423 if any list has an A record for the standard dns based lookup scheme
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parents: 167
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424 (reversed octets of the client followed by the dns suffix).
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425 </para></listitem>
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426 <listitem><para>
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427 If the mail has not been accepted or rejected yet, and the filtering
268
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diff changeset
428 context (or any ancestor context) requires matching reverse dns client
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diff changeset
429 name, the mail is rejected if the client name is empty or forged.
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parents: 263
diff changeset
430 </para></listitem>
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parents: 263
diff changeset
431 <listitem><para>
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diff changeset
432 If the mail has not been accepted or rejected yet, and the filtering
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parents: 168
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433 context (or any ancestor context) specifies a non-empty generic regular
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parents: 168
diff changeset
434 expression, then we check the fully qualified client name (obtained via
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parents: 168
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435 the sendmail macro "_"). The mail is rejected if the client name
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diff changeset
436 matches the specified regular expression.
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437 </para></listitem>
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438 <listitem><para>
108
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439 If the mail has not been accepted or rejected yet, we look for a
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parents: 104
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440 verification context, which is the closest ancestor of the filtering
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parents: 104
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441 context that both specifies a verification host, and which covers the
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442 envelope to address. If we find such a verification context, and the
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parents: 104
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443 verification host is not our own hostname, we open an smtp conversation
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parents: 104
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444 with that verification host. The current envelope from and recipient to
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445 values are passed to that verification host. If we receive a 5xy
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446 response those commands, we reject the current recipient with "no such
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447 user".
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448 </para></listitem>
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449 <listitem><para>
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450 If the mail has not been accepted or rejected yet, and the filtering
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parents: 104
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451 context enables content filtering, and this is the first such recipient
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452 in this smtp transaction, we set the content filtering parameters from
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453 this context, and enable content filtering for the body of this message.
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454 </para></listitem>
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455 </orderedlist>
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456 <para>
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457 For each recipient that was accepted, we search for an autowhite entry
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diff changeset
458 starting in the reply filtering context. If an autowhite entry is found,
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459 we add the recipient to that auto whitelist file. This will prevent reply
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460 messages from being blocked by the dnsbl or content filtering.
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diff changeset
461 </para>
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diff changeset
462 <para>
395
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diff changeset
463 If content filtering is enabled for this body, we look for dkim_signer
a8cf6a3da907 document dkim/spf processing
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parents: 360
diff changeset
464 and dkim_from sections in the current context and parents. We collect the
a8cf6a3da907 document dkim/spf processing
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parents: 360
diff changeset
465 signers of this message from the header added by the dkim-milter. If any
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parents: 360
diff changeset
466 of the message signers are whitelisted, the message is accepted.
a8cf6a3da907 document dkim/spf processing
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parents: 360
diff changeset
467 </para>
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parents: 360
diff changeset
468 <para>
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parents: 360
diff changeset
469 If the header from domain maps to required_signed then:
a8cf6a3da907 document dkim/spf processing
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parents: 360
diff changeset
470 If any of the message signers are in that list, the message is accepted.
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
471 If the source ip address passes a strong spf check for the header from
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
472 domain, the message is accepted. Otherwise, the message is rejected.
a8cf6a3da907 document dkim/spf processing
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parents: 360
diff changeset
473 </para>
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parents: 360
diff changeset
474 <para>
a8cf6a3da907 document dkim/spf processing
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parents: 360
diff changeset
475 If the header from domain maps to signed_white then:
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
476 If any of the message signers are in that list, the message is accepted.
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
477 If the source ip address passes a strong spf check for the header from
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
478 domain, the message is accepted. Otherwise, processing continues.
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
479 </para>
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parents: 360
diff changeset
480 <para>
a8cf6a3da907 document dkim/spf processing
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parents: 360
diff changeset
481 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
482 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
483 Otherwise, processing continues.
a8cf6a3da907 document dkim/spf processing
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parents: 360
diff changeset
484 </para>
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
485 <para>
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
486 If any of the message signers is blacklisted, the message is rejected.
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>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
489 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
490 (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
491 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
492 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
493 &lt;configurable&gt; host names are checked as follows.
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
494 </para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
495 <para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
496 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
497 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
498 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
499 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
500 &lt;configurable&gt; ignore list, the mail is rejected.
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
501 </para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
502 <para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
503 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
504 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
505 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
506 here, URIBL, SURBL, and DBL.
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
507 </para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
508 <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
509 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
510 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
511 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
512 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
513 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
514 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
515 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
516 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
517 </para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
518 <para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
519 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
520 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
521 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
522 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
523 </para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
524 <para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
525 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
526 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
527 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
528 than or equal to the DCC bulk score.
163
97d7da45fe2a spamassassin changes
carl
parents: 162
diff changeset
529 </para>
97d7da45fe2a spamassassin changes
carl
parents: 162
diff changeset
530 <para>
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
531 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
532 limit is exceeded, the mail is rejected.
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
533 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
534 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
535
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
536 <refsect1 id='access.1'>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
537 <title>Sendmail access vs. DNSBL</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
538 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
539 With the standard sendmail.mc dnsbl FEATURE, the dnsbl checks may be
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
540 suppressed by entries in the /etc/mail/access database. For example,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
541 suppose you control a /18 of address space, and have allocated some /24s
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
542 to some clients. You have access entries like
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
543 <literallayout class="monospaced"><![CDATA[
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
544 192.168.4 OK
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
545 192.168.17 OK]]></literallayout>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
546 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
547 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
548 to allow those clients to smarthost thru your mail server. Now if one
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
549 of those clients happens get infected with a virus that turns a machine
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
550 into an open proxy, and their 192.168.4.45 lands on the SBL-XBL, you
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
551 will still wind up allowing that infected machine to smarthost thru your
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
552 mail servers.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
553 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
554 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
555 With this DNSBL milter, the sendmail access database cannot override the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
556 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
557 smarthost mail server (unless the virus/proxy can use smtp-auth).
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
558 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
559 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
560 Using the standard sendmail features, you would add access entries to
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
561 allow hosts on your local network to relay thru your mail server. Those
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
562 OK entries in the sendmail access database will override all the dnsbl
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
563 checks. With this DNSBL milter, you will need to have the local users
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
564 authenticate with smtp-auth to get the same effect. You might find
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
565 <ulink
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
566 url="http://www.ists.dartmouth.edu/classroom/sendmail-ssl-how-to.php">
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
567 these directions</ulink> helpful for setting up smtp-auth if you are on
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
568 RH Linux.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
569 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
570 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
571
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
572 <refsect1 id='performance.1'>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
573 <title>Performance Issues</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
574 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
575 Consider a high volume high performance machine running sendmail. Each
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
576 sendmail process can do its own dns resolution. Typically, such dns
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
577 resolver libraries are not thread safe, and so must be protected by some
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
578 sort of mutex in a threaded environment. When we add a milter to
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
579 sendmail, we now have a collection of sendmail processes, and a
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
580 collection of milter threads.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
581 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
582 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
583 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
584 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
585 serialized inside the milter, we have an upper limit of about 25K mail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
586 messages per day. That is clearly not sufficient for many sites.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
587 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
588 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
589 Since we want to do parallel dns resolution across those milter threads,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
590 we add another collection of dns resolver processes. Each sendmail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
591 process is talking to a milter thread over a socket, and each milter
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
592 thread is talking to a dns resolver process over another socket.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
593 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
594 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
595 Suppose we are processing 20 messages per second, and each message
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
596 requires 20 seconds of dns work. Then we will have 400 sendmail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
597 processes, 400 milter threads, and 400 dns resolver processes. Of
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
598 course that steady state is very unlikely to happen.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
599 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
600 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
601
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
602
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
603 <refsect1 id='rejected.1'>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
604 <title>Rejected Ideas</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
605 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
606 The following ideas have been considered and rejected.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
607 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
608 <para>
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
609 Add max_recipients setting to the context configuration. Recipients in
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
610 excess of that limit will be rejected, and all the non-whitelisted
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
611 recipients will be removed. Current spammers *very* rarely send more
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
612 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
613 significant amount of spam.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
614 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
615 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
616 Add poison addresses to the configuration. If any recipient is
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
617 poison, all recipients are rejected even if they would be whitelisted,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
618 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
619 addresses that would be suitable for such use. Based on my log files,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
620 any mail to those spam trap addresses is rejected based on either dnsbl
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
621 lookups or the DCC. So this won't result in blocking any additional
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
622 spam.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
623 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
624 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
625 Add an option to only allow one recipient if the return path is
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
626 empty. Based on my log files, there is no mail that violates this
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
627 check.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
628 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
629 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
630 Reject the mail if the envelope from domain name contains any MX
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
631 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
632 spam sent with such domain names.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
633 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
634 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
635
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
636 <refsect1 id='todo.1'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
637 <title>TODO</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
638 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
639 The following ideas are under consideration.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
640 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
641 <para>
276
19ff60eaab74 more tld entries
Carl Byington <carl@five-ten-sg.com>
parents: 270
diff changeset
642 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
643 </para>
19ff60eaab74 more tld entries
Carl Byington <carl@five-ten-sg.com>
parents: 270
diff changeset
644 <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
645 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
646 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
647 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
648 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
649 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
650 </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
651 <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
652 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
653 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
654 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
655 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
656 </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
657 <para>
115
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
658 Look for href="hostname/path" strings that are missing the required
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
659 http:// protocol header. Such references are still clickable in common
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
660 mail software.
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
661 </para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
662 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
663
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
664 <refsect1 id='copyright.1'>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
665 <title>Copyright</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
666 <para>
261
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
667 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
668 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
669 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
670 This program is free software; you can redistribute it and/or modify it
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
671 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
672 Free Software Foundation; either version 3, or (at your option) any
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
673 later version.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
674 </para>
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 You should have received a copy of the GNU General Public License along
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
677 with this program; see the file COPYING. If not, please write to the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
678 Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
679 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
680 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
681
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
682 <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
683 <title>Version</title>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
684 <para>
201
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
685 @VERSION@
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
686 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
687 </refsect1>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
688 </refentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
689
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
690
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
691 <refentry id="@PACKAGE@.conf.5">
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
692 <refentryinfo>
395
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
693 <date>2017-03-07</date>
261
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
694 <author>
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
695 <firstname>Carl</firstname>
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
696 <surname>Byington</surname>
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
697 <affiliation><orgname>510 Software Group</orgname></affiliation>
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
698 </author>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
699 </refentryinfo>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
700
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
701 <refmeta>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
702 <refentrytitle>@PACKAGE@.conf</refentrytitle>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
703 <manvolnum>5</manvolnum>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
704 <refmiscinfo>@PACKAGE@ @VERSION@</refmiscinfo>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
705 </refmeta>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
706
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
707 <refnamediv id='name.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
708 <refname>@PACKAGE@.conf</refname>
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
709 <refpurpose>configuration file for @PACKAGE@ sendmail milter</refpurpose>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
710 </refnamediv>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
711
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
712 <refsynopsisdiv id='synopsis.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
713 <title>Synopsis</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
714 <cmdsynopsis>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
715 <command>@PACKAGE@.conf</command>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
716 </cmdsynopsis>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
717 </refsynopsisdiv>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
718
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
719 <refsect1 id='description.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
720 <title>Description</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
721 <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
722 specified by this partial bnf description. Comments start with //
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
723 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
724 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
725 <literallayout class="monospaced"><![CDATA[include "<file>";]]></literallayout>
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
726 </para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
727
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
728 <literallayout class="monospaced"><![CDATA[
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
729 CONFIG = {CONTEXT ";"}+
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
730 CONTEXT = "context" NAME "{" {STATEMENT}+ "}"
321
e172dc10fe24 add dkim white/black listing
Carl Byington <carl@five-ten-sg.com>
parents: 305
diff changeset
731 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
732 | 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
733 | RATE-LIMIT | REQUIRERDNS) ";"
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
734
124
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
735 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
736 DNSBLLIST = "dnsbl_list" {NAME}*
108
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carl
parents: 104
diff changeset
737
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
738 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
739 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
740 LEVEL = INTEGER
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
741
268
f941563c2a95 Add require_rdns checking
Carl Byington <carl@five-ten-sg.com>
parents: 263
diff changeset
742 REQUIRERDNS = "require_rdns" ("yes" | "no")
f941563c2a95 Add require_rdns checking
Carl Byington <carl@five-ten-sg.com>
parents: 263
diff changeset
743
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
744 CONTENT = "content" ("on" | "off") "{" {CONTENT-ST}+ "}"
322
9f8411f3919c add dkim white/black listing
Carl Byington <carl@five-ten-sg.com>
parents: 321
diff changeset
745 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
746 HOST-LIMIT | SPAMASS | REQUIRE | DCCGREY | DCCBULK | DKIM_SIGNER |
9f8411f3919c add dkim white/black listing
Carl Byington <carl@five-ten-sg.com>
parents: 321
diff changeset
747 DKIM_FROM) ";"
124
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
748 FILTER = "filter" DNSPREFIX ERROR-MSG2
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
749 URIBL = "uribl" DNSPREFIX ERROR-MSG3
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
750 IGNORE = "ignore" "{" {HOSTNAME [";"]}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
751 TLD = "tld" "{" {TLD [";"]}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
752 HTML-TAGS = "html_tags" "{" {HTMLTAG [";"]}+ "}"
124
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
753 ERROR-MSG1 = string containing exactly two %s replacement tokens
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
754 both are replaced with the client ip address
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
755 ERROR-MSG2 = string containing exactly two %s replacement tokens
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
756 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
757 is replaced with the ip address
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
758 ERROR-MSG3 = string containing exactly two %s replacement tokens
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
759 both are replaced with the hostname
108
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carl
parents: 104
diff changeset
760
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
761 HTML-LIMIT = "html_limit" ("on" INTEGER ERROR-MSG | "off")
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
762
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
763 HOST-LIMIT = "host_limit" ("on" INTEGER ERROR-MSG | "off" |
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
764 "soft" INTEGER)
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
765 SPAMASS = "spamassassin" INTEGER
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
766 REQUIRE = "require_match" ("yes" | "no")
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
767 DCCGREY = "dcc_greylist" ("yes" | "no")
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
768 DCCBULK = "dcc_bulk_threshold" (INTEGER | "many" | "off")
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
769
321
e172dc10fe24 add dkim white/black listing
Carl Byington <carl@five-ten-sg.com>
parents: 305
diff changeset
770 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
771 DKIMFROM = "dkim_from" "{" {HEADER_FROM_DOMAIN DKIMVALUE SIGNERS [";"]}+ "}"
321
e172dc10fe24 add dkim white/black listing
Carl Byington <carl@five-ten-sg.com>
parents: 305
diff changeset
772 DKIMVALUE = "signed_white" | "signed_black" | "require_signed"
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
773 SIGNERS = quoted comma separated SIGNING_DOMAINs no whitespace
321
e172dc10fe24 add dkim white/black listing
Carl Byington <carl@five-ten-sg.com>
parents: 305
diff changeset
774
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
775 ENV-TO = "env_to" "{" {(TO-ADDR | DCC-TO)}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
776 TO-ADDR = ADDRESS [";"]
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
777 DCC-TO = "dcc_to" ("ok" | "many") "{" DCCINCLUDEFILE "}" ";"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
778
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
779 VERIFY = "verify" HOSTNAME ";"
168
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
780 GENERIC = "generic" REGULAREXPRESSION ERROR-MSG4 ";"
233
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
781 W-REGEX = "white_regex" REGULAREXPRESSION ";"
168
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
782 ERROR-MSG4 = string containing exactly one %s replacement token
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
783 which is replaced with the client name
153
8d7c439bb6fa add auto whitelisting
carl
parents: 152
diff changeset
784 AUTOWHITE = "autowhite" DAYS FILENAME ";"
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
785
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
786 ENV_FROM = "env_from" [DEFAULT] "{" {(FROM-ADDR | DCC-FROM)}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
787 FROM-ADDR = ADDRESS VALUE [";"]
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
788 DCC-FROM = "dcc_from" "{" DCCINCLUDEFILE "}" ";"
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
789
278
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
790 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
791 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
792 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
793 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
794 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
795 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
796 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
797 DAILY_MULTIPLE_IP = INTEGER
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
798
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
799 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
800 DEFAULT = (DEF | "inherit" | "")
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
801 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
802 VALUE = (DEF | "inherit" | CHILD-CONTEXT-NAME)]]></literallayout>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
803 </refsect1>
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 <refsect1 id='sample.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
806 <title>Sample</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
807 <literallayout class="monospaced"><![CDATA[
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
808 context main-default {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
809 // 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
810 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
811 dnsbl_list sbl;
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
812
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
813 // outbound content filtering to prevent our own customers from sending spam
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
814 content on {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
815 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
816 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
817 #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
818 #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
819 ignore { include "hosts-ignore.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
820 tld { include "tld.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
821 html_tags { include "html-tags.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
822 html_limit on 20 "Mail containing excessive bad html tags rejected";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
823 html_limit off;
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
824 host_limit on 20 "Mail containing excessive host names rejected";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
825 host_limit soft 20;
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
826 spamassassin 4;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
827 require_match yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
828 dcc_greylist yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
829 dcc_bulk_threshold 50;
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
830 };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
831
278
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
832 // 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
833 // we only send bounces to our own customers
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
834 env_from unknown {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
835 "<>" black;
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
836 };
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
837
278
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
838 // 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
839 // 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
840 // 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
841 // 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
842 // 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
843 // 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
844 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
845 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
846 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
847 "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
848 "@otherdomain.tld" 100 2;
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
849 };
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
850 };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
851
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
852 context main {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
853 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
854 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
855 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
856 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
857 dnswl dnswl.org list.dnswl.org 2;
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
858 dnsbl_list local sbl;
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
859 dnswl_list dnswl.org;
268
f941563c2a95 Add require_rdns checking
Carl Byington <carl@five-ten-sg.com>
parents: 263
diff changeset
860 require_rdns yes;
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
861
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
862 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
863 dkim_signer {
395
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
864 #
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
865 # anything signed by this is accepted.
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
866 accounts.google.com white;
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
867 };
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
868 dkim_from {
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
869 #
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
870 # 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
871 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
872 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
873 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
874 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
875 #
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
876 # blacklisting based on header from value - requiring signatures
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
877 # from an impossible signer.
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
878 spammer.domain require_signed " ";
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
879 #
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
880 # 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
881 # an impossible signer (which will never happen) or strong spf pass.
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
882 some.domain signed_white " ";
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
883 #
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
884 # 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
885 # 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
886 paychex.com require_signed paychex.com;
a8cf6a3da907 document dkim/spf processing
Carl Byington <carl@five-ten-sg.com>
parents: 360
diff changeset
887 #
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
888 };
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
889 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
890 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
891 #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
892 #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
893 ignore { include "hosts-ignore.conf"; };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
894 tld { include "tld.conf"; };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
895 html_tags { include "html-tags.conf"; };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
896 html_limit off;
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
897 host_limit soft 20;
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
898 spamassassin 5;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
899 require_match yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
900 dcc_greylist yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
901 dcc_bulk_threshold 20;
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
902 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
903
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
904 generic "^dsl.static.*ttnet.net.tr$|(^|[x.-])(ppp|h|host)?([0-9]{1,3}[x.-](Red-|dynamic[x.-])?){4}"
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
905 "your mail server %s seems to have a generic name";
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
906
259
be939802c64e add recipient rate limits by email from address or domain
Carl Byington <carl@five-ten-sg.com>
parents: 255
diff changeset
907 white_regex "=example.com=user@yourhostingaccount.com$";
233
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
908
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
909 env_to {
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
910 # !! replace this with your domain names
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
911 # child contexts are not allowed to specify recipient addresses outside these domains
179
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
912 # 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
913 include "/etc/mail/local-host-names";
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
914 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
915
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
916 context whitelist {
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
917 content off {};
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
918 env_to {
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
919 # dcc_to ok { include "/var/dcc/whitecommon"; };
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
920 };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
921 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
922 # so all mail TO these env_to addresses is accepted
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
923 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
924
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
925 context abuse {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
926 dnsbl_list xbl;
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
927 content off {};
174
da0c41b9f672 don't whitelist addresses with embedded spaces
carl
parents: 172
diff changeset
928 generic "^$ " " "; # regex cannot match, to disable generic rdns rejects
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
929 env_to {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
930 abuse@ # no content filtering on abuse reports
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
931 postmaster@ # ""
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
932 };
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
933 env_from unknown {}; # ignore all parent white/black listing
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
934 };
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
935
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
936 context minimal {
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
937 dnsbl_list sbl;
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
938 content on {
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
939 spamassassin 10;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
940 dcc_bulk_threshold many;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
941 };
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
942 generic "^$ " " "; # regex cannot match, to disable generic rdns rejects
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
943 env_to {
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
944 };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
945 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
946
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
947 context blacklist {
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>
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948 dnsbl_list ;
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949 dnswl_list ;
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950 env_to {
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951 # dcc_to many { include "/var/dcc/whitecommon"; };
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952 };
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953 env_from black {}; # black forces all unmatched from addresses (everyone in this case) to be blacklisted
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954 # so all mail TO these env_to addresses is rejected
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955 };
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956
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957 env_from unknown {
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958 abuse@ abuse; # replies to abuse reports use the abuse context
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959 # dcc_from { include "/var/dcc/whitecommon"; };
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960 };
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961
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962 autowhite 90 "autowhite/my-auto-whitelist";
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963 # install should create /etc/dnsbl/autowhite writable by userid dnsbl
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964 };]]></literallayout>
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965 </refsect1>
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966
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967 <refsect1 id='version.5'>
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968 <title>Version</title>
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969 <para>
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970 @VERSION@
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971 </para>
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972 </refsect1>
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973
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974 </refentry>
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975 </reference>