annotate xml/dnsbl.in @ 272:a99b6c1f5f67

Code cleanup, increase minimum hostname length for uribl checking
author Carl Byington <carl@five-ten-sg.com>
date Mon, 09 Sep 2013 19:30:21 -0700
parents f92f24950bd3
children 19ff60eaab74
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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>The various source and binary packages are available at <ulink
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7 url="http://www.five-ten-sg.com/@PACKAGE@/packages/">http://www.five-ten-sg.com/@PACKAGE@/packages/</ulink>.
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8 The most recent documentation is available at <ulink
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9 url="http://www.five-ten-sg.com/@PACKAGE@/">http://www.five-ten-sg.com/@PACKAGE@/</ulink>.
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10 </para>
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11
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12 <para>A <ulink
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13 url="http://www.selenic.com/mercurial/wiki/">Mercurial</ulink> source
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14 code repository for this project is available at <ulink
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15 url="http://hg.five-ten-sg.com/@PACKAGE@/">http://hg.five-ten-sg.com/@PACKAGE@/</ulink>.
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16 </para>
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17
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18 </partintro>
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19
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20 <refentry id="@PACKAGE@.1">
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21 <refentryinfo>
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22 <date>2013-05-22</date>
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23 <author>
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24 <firstname>Carl</firstname>
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25 <surname>Byington</surname>
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26 <affiliation><orgname>510 Software Group</orgname></affiliation>
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27 </author>
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28 </refentryinfo>
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29
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30 <refmeta>
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31 <refentrytitle>@PACKAGE@</refentrytitle>
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32 <manvolnum>1</manvolnum>
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33 <refmiscinfo>@PACKAGE@ @VERSION@</refmiscinfo>
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34 </refmeta>
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35
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36 <refnamediv id='name.1'>
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37 <refname>@PACKAGE@</refname>
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38 <refpurpose>a sendmail milter with per-user dnsbl filtering</refpurpose>
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39 </refnamediv>
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40
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41 <refsynopsisdiv id='synopsis.1'>
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42 <title>Synopsis</title>
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43 <cmdsynopsis>
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44 <command>@PACKAGE@</command>
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45 <arg><option>-c</option></arg>
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46 <arg><option>-s</option></arg>
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47 <arg><option>-d <replaceable class="parameter">n</replaceable></option></arg>
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48 <arg><option>-e <replaceable class="parameter">from|to</replaceable></option></arg>
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49 <arg><option>-b <replaceable class="parameter">local-domain-socket</replaceable></option></arg>
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50 <arg><option>-r <replaceable class="parameter">local-domain-socket</replaceable></option></arg>
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51 <arg><option>-p <replaceable class="parameter">sendmail-socket</replaceable></option></arg>
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52 <arg><option>-t <replaceable class="parameter">timeout</replaceable></option></arg>
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53 </cmdsynopsis>
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54 </refsynopsisdiv>
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55
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56 <refsect1 id='options.1'>
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57 <title>Options</title>
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58 <variablelist>
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59 <varlistentry>
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60 <term>-c</term>
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61 <listitem><para>
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62 Load the configuration file, print a cannonical form
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63 of the configuration on stdout, and exit.
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64 </para></listitem>
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65 </varlistentry>
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66 <varlistentry>
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67 <term>-s</term>
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68 <listitem><para>
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69 Stress test the configuration loading code by repeating
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70 the load/free cycle in an infinite loop.
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71 </para></listitem>
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72 </varlistentry>
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73 <varlistentry>
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74 <term>-d <replaceable class="parameter">n</replaceable></term>
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75 <listitem><para>
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76 Set the debug level to <replaceable class="parameter">n</replaceable>.
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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>-e <replaceable class="parameter">from|to</replaceable></term>
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81 <listitem><para>
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82 Print the results of looking up the from and to addresses in the
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83 current configuration. The | character is used to separate the from and to
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84 addresses in the argument to the -e switch.
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85 </para></listitem>
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86 </varlistentry>
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87 <varlistentry>
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88 <term>-b <replaceable class="parameter">local-domain-socket-file-name</replaceable></term>
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89 <listitem><para>
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90 Set the local socket used for the connection to the dccifd daemon.
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91 This is typically /var/dcc/dccifd.
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92 </para></listitem>
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93 </varlistentry>
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94 <varlistentry>
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95 <term>-r <replaceable class="parameter">local-domain-socket-file-name</replaceable></term>
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96 <listitem><para>
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97 Set the local socket used for the connection to our own dns resolver processes.
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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>-p <replaceable class="parameter">sendmail-socket</replaceable></term>
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102 <listitem><para>
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103 Set the socket used for the milter connection to sendmail. This is either
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104 "inet:port@ip-address" or "local:local-domain-socket-file-name".
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105 </para></listitem>
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106 </varlistentry>
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107 <varlistentry>
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108 <term>-t <replaceable class="parameter">timeout</replaceable></term>
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109 <listitem><para>
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110 Set the timeout in seconds used for communication with sendmail.
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111 </para></listitem>
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112 </varlistentry>
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113 </variablelist>
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114 </refsect1>
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115
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116 <refsect1 id='usage.1'>
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117 <title>Usage</title>
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118 <para><command>@PACKAGE@</command> -c</para>
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119 <para><command>@PACKAGE@</command> -s</para>
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120 <para><command>@PACKAGE@</command> -e 'someone@aol.com|localname@mydomain.tld'</para>
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121 <para><command>@PACKAGE@</command> -d 10 -r resolver.sock -p local:dnsbl.sock</para>
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122 </refsect1>
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123
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124 <refsect1 id='installation.1'>
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125 <title>Installation</title>
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126 <para>
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127 This is now a standard GNU autoconf/automake installation, so the normal
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128 "./configure; make; su; make install" works. "make chkconfig" will
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129 setup the init.d runlevel scripts. Alternatively, you can use the
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130 source or binary RPMs at <ulink
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131 url="http://www.five-ten-sg.com/@PACKAGE@/packages">http://www.five-ten-sg.com/@PACKAGE@/packages</ulink>.
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132 </para>
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133 <para>
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134 Note that this has ONLY been tested on Linux, specifically RedHat Linux.
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135 In particular, this milter makes no attempt to understand IPv6. Your
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136 mileage will vary. You will need at a minimum a C++ compiler with a
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137 minimally thread safe STL implementation. The distribution includes a
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138 test.cpp program. If it fails this milter won't work. If it passes,
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139 this milter might work.
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140 </para>
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141 <para>
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142 Modify your sendmail.mc by removing all the "FEATURE(dnsbl" lines, add
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143 the following line in your sendmail.mc and rebuild the .cf file
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144 </para>
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145 <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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146 <para>
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147 Modify the default <citerefentry>
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148 <refentrytitle>@PACKAGE@.conf</refentrytitle> <manvolnum>5</manvolnum>
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149 </citerefentry> configuration.
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150 </para>
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151 </refsect1>
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152
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153 <refsect1 id='configuration.1'>
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154 <title>Configuration</title>
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155 <para>
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156 The configuration file is documented in <citerefentry>
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157 <refentrytitle>@PACKAGE@.conf</refentrytitle> <manvolnum>5</manvolnum>
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158 </citerefentry>. Any change to the config file, or any file included
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159 from that config file, will cause it to be reloaded within three
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160 minutes.
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161 </para>
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162 </refsect1>
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163
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164 <refsect1 id='introduction.1'>
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165 <title>Introduction</title>
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166 <para>
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167 Consider the case of a mail server that is acting as secondary MX for a
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168 collection of clients, each of which has a collection of mail domains.
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169 Each client may use their own collection of DNSBLs on their primary mail
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170 server. We present here a mechanism whereby the backup mail server can
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171 use the correct set of DNSBLs for each recipient for each message. As a
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172 side-effect, it gives us the ability to customize the set of DNSBLs on a
183
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173 per-recipient basis, so that fred@example.com could use LOCAL and the
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174 SBL, where all other users @example.com use only the SBL.
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175 </para>
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176 <para>
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177 This milter can also verify the envelope from/recipient pairs with the
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178 primary MX server. This allows the backup mail servers to properly
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179 reject mail sent to invalid addresses. Otherwise, the backup mail
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180 servers will accept that mail, and then generate a bounce message when
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181 the message is forwarded to the primary server (and rejected there with
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182 no such user). These rejections are the primary cause of such backscatter.
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183 </para>
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184 <para>
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185 This milter will also decode (uuencode, base64, mime, html entity, url
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186 encodings) and scan for HTTP and HTTPS URLs and bare hostnames in the
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187 body of the mail. If any of those host names have A or NS records on
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188 the SBL (or a single configurable DNSBL), the mail will be rejected
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189 unless previously whitelisted. This milter also counts the number of
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190 invalid HTML tags, and can reject mail if that count exceeds your
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191 specified limit.
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192 </para>
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193 <para>
259
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194 This milter can also impose hourly and daily rate
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195 limits on the number of recipients accepted from SMTP
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196 AUTH connections, that would otherwise be allowed to
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197 relay thru this mail server with no spam filtering. If
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198 the connection does not use SMTP AUTH, the rate limits
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199 may be specified by the mail from email address or
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200 domain.
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201 </para>
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202 <para>
162
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203 Consider the case of a message from A to B passing thru this milter. If
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204 that message is not blocked, then we might eventually see a reply
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205 message from B to A. If the filtering context for A includes an
162
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206 autowhite entry, and that context does <emphasis>not</emphasis> cover B
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207 as a recipient, then this milter will add an entry in that file to
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208 whitelist such replies for a configurable time period. Suppose A and B
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209 are in the same domain, or at least use the same filtering context. In
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210 that case we don't want to add a whitelist entry for B, since that would
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211 then allow spammers to send mail from B (forged) to B. Such autowhite
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212 files need to be writeable by the dnsbl user, where all the other dnsbl
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213 configuration files only need to be readable by the dnsbl user.
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214 </para>
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215 <para>
176
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216 You can manually add such an autowhite entry, by appending a single
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217 text line to the autowhitelist file, using something like
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218 <command>echo "$mail 0" >>$autowhitefile</command>.
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219 You can manually remove such an autowhite entry, by appending a single
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220 text line to the autowhitelist file, using something like
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221 <command>echo "$mail 1" >>$autowhitefile</command>.
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222 </para>
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223 <para>
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224 The DNSBL milter reads a text configuration file (dnsbl.conf) on
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225 startup, and whenever the config file (or any of the referenced include
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226 files) is changed. The entire configuration file is case insensitive.
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227 If the configuration cannot be loaded due to a syntax error, the milter
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228 will log the error and quit. If the configuration cannot be reloaded
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229 after being modified, the milter will log the error and send an email to
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230 root from dnsbl@$hostname. You probably want to add dnsbl@$hostname
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231 to your /etc/mail/virtusertable since otherwise sendmail will reject
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232 that message.
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233 </para>
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234 </refsect1>
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235
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236 <refsect1 id='dcc.1'>
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237 <title>DCC Issues</title>
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238 <para>
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239 If you are also using the <ulink
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240 url="http://www.rhyolite.com/anti-spam/dcc/">DCC</ulink> milter, there
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241 are a few considerations. You may need to whitelist senders from the
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242 DCC bulk detector, or from the DNS based lists. Those are two very
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243 different reasons for whitelisting. The former is done thru the DCC
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244 whiteclnt config file, the later is done thru the DNSBL milter config
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245 file.
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246 </para>
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247 <para>
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248 You may want to blacklist some specific senders or sending domains.
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249 This could be done thru either the DCC (on a global basis, or for a
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250 specific single recipient). We prefer to do such blacklisting via the
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251 DNSBL milter config, since it can be done for a collection of recipient
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252 mail domains. The DCC approach has the feature that you can capture the
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253 entire message in the DCC log files. The DNSBL milter approach has the
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254 feature that the mail is rejected earlier (at RCPT TO time), and the
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255 sending machine just gets a generic "550 5.7.1 no such user" message.
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256 </para>
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257 <para>
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258 The DCC whiteclnt file can be included in the DNSBL milter config by the
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259 dcc_to and dcc_from statements. This will import the (env_to, env_from,
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260 and substitute mail_host) entries from the DCC config into the DNSBL
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261 config. This allows using the DCC config as the single point for
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262 white/blacklisting.
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263 </para>
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264 <para>
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265 Consider the case where you have multiple clients, each with their own
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266 mail servers, and each running their own DCC milters. Each client is
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267 using the DCC facilities for envelope from/to white/blacklisting.
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268 Presumably you can use rsync or scp to fetch copies of your clients DCC
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269 whiteclnt files on a regular basis. Your mail server, acting as a
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270 backup MX for your clients, can use the DNSBL milter, and include those
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271 client DCC config files. The envelope from/to white/blacklisting will
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272 be appropriately tagged and used only for the domains controlled by each
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273 of those clients.
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274 </para>
179
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275 <para>
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276 You can now use (via dccifd) different dcc filtering parameters on a per
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277 context basis. See the dcc_greylist and dcc_bulk_threshold statements
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278 in the <citerefentry> <refentrytitle>@PACKAGE@.conf</refentrytitle>
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279 <manvolnum>5</manvolnum> </citerefentry> configuration. Those
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280 statements are only active if you supply the <option>-b</option> option
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281 on the dnsbl command line. If you use the dcc via the standard dcc
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282 milter (dccm), then connections from clients that use SMTP AUTH are
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283 still subject to greylisting. If you use the dcc via dccifd and this
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284 milter, then connections from clients that use SMTP AUTH are never
180
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285 subject to greylisting. As part of this per-user greylisting, you need
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286 to move the dnsblnogrey file from the config directory to something
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287 like /var/dcc/userdirs/local/dnsblnogrey/whiteclnt so the dccifd will
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288 properly ignore greylisting for those recipients that don't want it.
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289 </para>
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290 </refsect1>
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291
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292 <refsect1 id='definitions.1'>
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293 <title>Definitions</title>
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294 <para>
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295 CONTEXT - a collection of parameters that defines the filtering context
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296 to be used for a collection of envelope recipient addresses. The
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297 context includes such things as the list of DNSBLs to be used, and the
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298 various content filtering parameters.
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299 </para>
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300 <para>
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301 DNSBL - a named DNS based blocking list is defined by a dns suffix (e.g.
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302 sbl-xbl.spamhaus.org) and a message string that is used to generate the
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303 "550 5.7.1" smtp error return code. The names of these DNSBLs will be
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304 used to define the DNSBL-LISTs.
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305 </para>
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306 <para>
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307 DNSBL-LIST - a named list of DNSBLs that will be used for specific
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308 recipients or recipient domains.
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309 </para>
249
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310 <para>
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311 DNSWL - a named DNS based white list is defined by a dns suffix (e.g.
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312 list.dnswl.org) and an integer level. If the level is greater than or
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313 equal to x in the 127.0.z.x return code from the white list, then the
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314 ip address is considered to match, and the message will be whitelisted.
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315 The names of these DNSWLs will be used to define the DNSWL-LISTs.
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316 </para>
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317 <para>
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318 DNSWL-LIST - a named list of DNSWLs that will be used for specific
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319 recipients or recipient domains.
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320 </para>
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321 </refsect1>
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322
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323 <refsect1 id='filtering.1'>
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324 <title>Filtering Procedure</title>
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325 <para>
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326 The SMTP envelope 'from' and 'to' values are used in various checks.
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327 The first check is to see if a reply message (swapping the env_from and
160
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328 env_to values) would be unconditionally blocked (just based on the
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329 envelope from address). That check is similar to the main check
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diff changeset
330 described below, but there is no body content to be scanned, and there
b3ed72ee6564 allow manual updates to auto whitelist files
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parents: 158
diff changeset
331 is no client connection ip address to be checked against DNSBLs. If
b3ed72ee6564 allow manual updates to auto whitelist files
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parents: 158
diff changeset
332 such a reply message would be blocked, we also block the original
b3ed72ee6564 allow manual updates to auto whitelist files
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parents: 158
diff changeset
333 outgoing message. This prevents folks from sending mail to recipients
b3ed72ee6564 allow manual updates to auto whitelist files
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parents: 158
diff changeset
334 that are unable to reply.
152
c7fc218686f5 gpl3, block mail to recipients that cannot reply
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335 </para>
c7fc218686f5 gpl3, block mail to recipients that cannot reply
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diff changeset
336 <para>
136
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diff changeset
337 If the client has authenticated with sendmail, the rate limits are
268
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Carl Byington <carl@five-ten-sg.com>
parents: 263
diff changeset
338 checked. If the authenticated user has not exceeded the hourly or daily rate
f941563c2a95 Add require_rdns checking
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parents: 263
diff changeset
339 limits, then the mail is accepted, the filtering contexts are not used,
136
f4746d8a12a3 add smtp auth rate limits
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parents: 127
diff changeset
340 the dns lists are not checked, and the body content is not scanned. If
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
341 the client has not authenticated with sendmail, we follow these steps
f4746d8a12a3 add smtp auth rate limits
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diff changeset
342 for each recipient.
108
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343 </para>
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diff changeset
344 <orderedlist>
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345 <listitem><para>
108
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parents: 104
diff changeset
346 The envelope to email address is used to find an initial filtering
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
347 context. We first look for a context that specified the full email
1c7677042b78 move to autoconf/automake/docbook
carl
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diff changeset
348 address in the env_to statement. If that is not found, we look for a
1c7677042b78 move to autoconf/automake/docbook
carl
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diff changeset
349 context that specified the entire domain name of the envelope recipient
1c7677042b78 move to autoconf/automake/docbook
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diff changeset
350 in the env_to statement. If that is not found, we look for a context
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
351 that specified the user@ part of the envelope recipient in the env_to
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
352 statement. If that is not found, we use the first top level context
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diff changeset
353 defined in the config file.
111
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354 </para></listitem>
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parents: 108
diff changeset
355 <listitem><para>
108
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parents: 104
diff changeset
356 The initial filtering context may redirect to a child context based on
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
357 the values in the initial context's env_from statement. We look for [1)
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
358 the full envelope from email address, 2) the domain name part of the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
359 envelope from address, 3) the user@ part of the envelope from address]
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
360 in that context's env_from statement, with values that point to a child
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
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361 context. If such an entry is found, we switch to that child filtering
1c7677042b78 move to autoconf/automake/docbook
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diff changeset
362 context.
111
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diff changeset
363 </para></listitem>
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parents: 108
diff changeset
364 <listitem><para>
108
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parents: 104
diff changeset
365 We lookup [1) the full envelope from email address, 2) the domain name
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
366 part of the envelope from address, 3) the user@ part of the envelope
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
367 from address] in the filtering context env_from statement. That results
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
368 in one of (white, black, unknown, inherit).
111
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369 </para></listitem>
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parents: 108
diff changeset
370 <listitem><para>
108
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parents: 104
diff changeset
371 If the answer is black, mail to this recipient is rejected with "no such
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
372 user", and the dns lists are not checked.
111
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373 </para></listitem>
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parents: 108
diff changeset
374 <listitem><para>
108
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parents: 104
diff changeset
375 If the answer is white, mail to this recipient is accepted and the dns
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carl
parents: 104
diff changeset
376 lists are not checked.
111
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parents: 108
diff changeset
377 </para></listitem>
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carl
parents: 108
diff changeset
378 <listitem><para>
108
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parents: 104
diff changeset
379 If the answer is unknown, we don't reject yet, but the dns lists will be
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
380 checked, and the content may be scanned.
111
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parents: 108
diff changeset
381 </para></listitem>
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carl
parents: 108
diff changeset
382 <listitem><para>
108
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parents: 104
diff changeset
383 If the answer is inherit, we repeat the envelope from search in the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
384 parent context.
111
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diff changeset
385 </para></listitem>
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parents: 108
diff changeset
386 <listitem><para>
233
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
387 If the mail has not been accepted or rejected yet, and the filtering
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
388 context (or any ancestor context) specifies a non-empty whitelist regular
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
389 expression, then we check the envelope from value against that regex.
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
390 The mail is accepted if the envelope from value matches the specified regular
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
391 expression.
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
392 </para></listitem>
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
393 <listitem><para>
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
394 If the mail has not been accepted or rejected yet, the dns white lists
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
395 specified in the filtering context are checked and the mail is accepted
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
396 if any list has an A record for the standard dns based lookup scheme
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
397 (reversed octets of the client followed by the dns suffix) with a final
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
398 octet greater than or equal to the level specified for that dnswl.
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
399 </para></listitem>
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
400 <listitem><para>
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
401 If the mail has not been accepted or rejected yet, the dns black lists
168
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
402 specified in the filtering context are checked and the mail is rejected
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
403 if any list has an A record for the standard dns based lookup scheme
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
404 (reversed octets of the client followed by the dns suffix).
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
405 </para></listitem>
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
406 <listitem><para>
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
407 If the mail has not been accepted or rejected yet, and the filtering
268
f941563c2a95 Add require_rdns checking
Carl Byington <carl@five-ten-sg.com>
parents: 263
diff changeset
408 context (or any ancestor context) requires matching reverse dns client
f941563c2a95 Add require_rdns checking
Carl Byington <carl@five-ten-sg.com>
parents: 263
diff changeset
409 name, the mail is rejected if the client name is empty or forged.
f941563c2a95 Add require_rdns checking
Carl Byington <carl@five-ten-sg.com>
parents: 263
diff changeset
410 </para></listitem>
f941563c2a95 Add require_rdns checking
Carl Byington <carl@five-ten-sg.com>
parents: 263
diff changeset
411 <listitem><para>
f941563c2a95 Add require_rdns checking
Carl Byington <carl@five-ten-sg.com>
parents: 263
diff changeset
412 If the mail has not been accepted or rejected yet, and the filtering
170
bd33eaccfed8 fix pre/post scripts in rpm spec file
carl
parents: 168
diff changeset
413 context (or any ancestor context) specifies a non-empty generic regular
bd33eaccfed8 fix pre/post scripts in rpm spec file
carl
parents: 168
diff changeset
414 expression, then we check the fully qualified client name (obtained via
bd33eaccfed8 fix pre/post scripts in rpm spec file
carl
parents: 168
diff changeset
415 the sendmail macro "_"). The mail is rejected if the client name
bd33eaccfed8 fix pre/post scripts in rpm spec file
carl
parents: 168
diff changeset
416 matches the specified regular expression.
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
417 </para></listitem>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
418 <listitem><para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
419 If the mail has not been accepted or rejected yet, we look for a
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
420 verification context, which is the closest ancestor of the filtering
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
421 context that both specifies a verification host, and which covers the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
422 envelope to address. If we find such a verification context, and the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
423 verification host is not our own hostname, we open an smtp conversation
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
424 with that verification host. The current envelope from and recipient to
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
425 values are passed to that verification host. If we receive a 5xy
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
426 response those commands, we reject the current recipient with "no such
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
427 user".
111
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carl
parents: 108
diff changeset
428 </para></listitem>
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carl
parents: 108
diff changeset
429 <listitem><para>
108
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carl
parents: 104
diff changeset
430 If the mail has not been accepted or rejected yet, and the filtering
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
431 context enables content filtering, and this is the first such recipient
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
432 in this smtp transaction, we set the content filtering parameters from
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
433 this context, and enable content filtering for the body of this message.
111
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carl
parents: 108
diff changeset
434 </para></listitem>
108
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carl
parents: 104
diff changeset
435 </orderedlist>
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carl
parents: 104
diff changeset
436 <para>
160
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
437 For each recipient that was accepted, we search for an autowhite entry
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
438 starting in the reply filtering context. If an autowhite entry is found,
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
439 we add the recipient to that auto whitelist file. This will prevent reply
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
440 messages from being blocked by the dnsbl or content filtering.
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
441 </para>
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
442 <para>
108
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carl
parents: 104
diff changeset
443 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
444 (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
445 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
446 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
447 &lt;configurable&gt; host names are checked as follows.
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
448 </para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
449 <para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
450 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
451 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
452 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
453 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
454 &lt;configurable&gt; ignore list, the mail is rejected.
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
455 </para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
456 <para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
457 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
458 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
459 ignore list, the mail is rejected. There are three lists that are suitable
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
460 here, uribl, surbl, and dbl.
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
461 </para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
462 <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
463 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
464 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
465 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
466 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
467 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
468 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
469 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
470 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
471 </para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
472 <para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
473 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
474 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
475 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
476 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
477 </para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
478 <para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
479 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
480 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
481 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
482 than or equal to the DCC bulk score.
163
97d7da45fe2a spamassassin changes
carl
parents: 162
diff changeset
483 </para>
97d7da45fe2a spamassassin changes
carl
parents: 162
diff changeset
484 <para>
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
485 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
486 limit is exceeded, the mail is rejected.
108
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carl
parents: 104
diff changeset
487 </para>
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carl
parents: 104
diff changeset
488 </refsect1>
94
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carl
parents: 92
diff changeset
489
111
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carl
parents: 108
diff changeset
490 <refsect1 id='access.1'>
108
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carl
parents: 104
diff changeset
491 <title>Sendmail access vs. DNSBL</title>
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carl
parents: 104
diff changeset
492 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
493 With the standard sendmail.mc dnsbl FEATURE, the dnsbl checks may be
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
494 suppressed by entries in the /etc/mail/access database. For example,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
495 suppose you control a /18 of address space, and have allocated some /24s
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
496 to some clients. You have access entries like
111
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parents: 108
diff changeset
497 <literallayout class="monospaced"><![CDATA[
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carl
parents: 108
diff changeset
498 192.168.4 OK
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carl
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diff changeset
499 192.168.17 OK]]></literallayout>
108
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carl
parents: 104
diff changeset
500 </para>
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carl
parents: 104
diff changeset
501 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
502 to allow those clients to smarthost thru your mail server. Now if one
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
503 of those clients happens get infected with a virus that turns a machine
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
504 into an open proxy, and their 192.168.4.45 lands on the SBL-XBL, you
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carl
parents: 104
diff changeset
505 will still wind up allowing that infected machine to smarthost thru your
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
506 mail servers.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
507 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
508 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
509 With this DNSBL milter, the sendmail access database cannot override the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
510 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
511 smarthost mail server (unless the virus/proxy can use smtp-auth).
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
512 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
513 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
514 Using the standard sendmail features, you would add access entries to
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
515 allow hosts on your local network to relay thru your mail server. Those
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
516 OK entries in the sendmail access database will override all the dnsbl
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
517 checks. With this DNSBL milter, you will need to have the local users
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
518 authenticate with smtp-auth to get the same effect. You might find
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
519 <ulink
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
520 url="http://www.ists.dartmouth.edu/classroom/sendmail-ssl-how-to.php">
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
521 these directions</ulink> helpful for setting up smtp-auth if you are on
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
522 RH Linux.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
523 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
524 </refsect1>
94
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carl
parents: 92
diff changeset
525
111
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parents: 108
diff changeset
526 <refsect1 id='performance.1'>
108
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carl
parents: 104
diff changeset
527 <title>Performance Issues</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
528 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
529 Consider a high volume high performance machine running sendmail. Each
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
530 sendmail process can do its own dns resolution. Typically, such dns
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
531 resolver libraries are not thread safe, and so must be protected by some
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
532 sort of mutex in a threaded environment. When we add a milter to
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
533 sendmail, we now have a collection of sendmail processes, and a
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
534 collection of milter threads.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
535 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
536 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
537 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
538 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
539 serialized inside the milter, we have an upper limit of about 25K mail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
540 messages per day. That is clearly not sufficient for many sites.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
541 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
542 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
543 Since we want to do parallel dns resolution across those milter threads,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
544 we add another collection of dns resolver processes. Each sendmail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
545 process is talking to a milter thread over a socket, and each milter
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
546 thread is talking to a dns resolver process over another socket.
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 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
549 Suppose we are processing 20 messages per second, and each message
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
550 requires 20 seconds of dns work. Then we will have 400 sendmail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
551 processes, 400 milter threads, and 400 dns resolver processes. Of
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
552 course that steady state is very unlikely to happen.
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 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
555
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
556
111
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carl
parents: 108
diff changeset
557 <refsect1 id='rejected.1'>
108
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carl
parents: 104
diff changeset
558 <title>Rejected Ideas</title>
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 The following ideas have been considered and rejected.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
561 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
562 <para>
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
563 Add max_recipients setting to the context configuration. Recipients in
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
564 excess of that limit will be rejected, and all the non-whitelisted
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
565 recipients will be removed. Current spammers *very* rarely send more
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
566 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
567 significant amount of spam.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
568 </para>
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 Add poison addresses to the configuration. If any recipient is
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
571 poison, all recipients are rejected even if they would be whitelisted,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
572 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
573 addresses that would be suitable for such use. Based on my log files,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
574 any mail to those spam trap addresses is rejected based on either dnsbl
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
575 lookups or the DCC. So this won't result in blocking any additional
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
576 spam.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
577 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
578 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
579 Add an option to only allow one recipient if the return path is
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
580 empty. Based on my log files, there is no mail that violates this
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
581 check.
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 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
584 Reject the mail if the envelope from domain name contains any MX
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
585 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
586 spam sent with such domain names.
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 </refsect1>
94
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parents: 92
diff changeset
589
108
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parents: 104
diff changeset
590 <refsect1 id='todo.1'>
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carl
parents: 104
diff changeset
591 <title>TODO</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
592 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
593 The following ideas are under consideration.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
594 </para>
1c7677042b78 move to autoconf/automake/docbook
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diff changeset
595 <para>
270
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parents: 268
diff changeset
596 Add white/unknown to config for smtp authenticated connections. Currently
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
597 any authenticated connection is fully whitelisted. This would allow normal
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
598 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
599 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
600 </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
601 <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
602 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
603 authenticated connections. User abc could be restricted to envelope from
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
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parents: 268
diff changeset
604 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
605 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
606 </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
607 <para>
115
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
608 Look for href="hostname/path" strings that are missing the required
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
609 http:// protocol header. Such references are still clickable in common
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
610 mail software.
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
611 </para>
108
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parents: 104
diff changeset
612 </refsect1>
94
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carl
parents: 92
diff changeset
613
111
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parents: 108
diff changeset
614 <refsect1 id='copyright.1'>
108
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parents: 104
diff changeset
615 <title>Copyright</title>
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parents: 104
diff changeset
616 <para>
261
92a98e661a0b update documentation for newer xml dtd
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parents: 259
diff changeset
617 Copyright (C) 2012 by 510 Software Group &lt;carl@five-ten-sg.com&gt;
108
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parents: 104
diff changeset
618 </para>
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carl
parents: 104
diff changeset
619 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
620 This program is free software; you can redistribute it and/or modify it
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
621 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
622 Free Software Foundation; either version 3, or (at your option) any
108
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parents: 104
diff changeset
623 later version.
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 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
626 You should have received a copy of the GNU General Public License along
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
627 with this program; see the file COPYING. If not, please write to the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
628 Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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 </refsect1>
94
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carl
parents: 92
diff changeset
631
111
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parents: 108
diff changeset
632 <refsect1 id='version.1'>
201
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parents: 187
diff changeset
633 <title>Version</title>
108
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parents: 104
diff changeset
634 <para>
201
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parents: 187
diff changeset
635 @VERSION@
108
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parents: 104
diff changeset
636 </para>
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parents: 104
diff changeset
637 </refsect1>
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carl
parents: 104
diff changeset
638 </refentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
639
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
640
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
641 <refentry id="@PACKAGE@.conf.5">
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parents: 104
diff changeset
642 <refentryinfo>
270
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
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diff changeset
643 <date>2013-05-22</date>
261
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parents: 259
diff changeset
644 <author>
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
645 <firstname>Carl</firstname>
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
646 <surname>Byington</surname>
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
647 <affiliation><orgname>510 Software Group</orgname></affiliation>
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
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diff changeset
648 </author>
108
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parents: 104
diff changeset
649 </refentryinfo>
94
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parents: 92
diff changeset
650
108
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parents: 104
diff changeset
651 <refmeta>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
652 <refentrytitle>@PACKAGE@.conf</refentrytitle>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
653 <manvolnum>5</manvolnum>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
654 <refmiscinfo>@PACKAGE@ @VERSION@</refmiscinfo>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
655 </refmeta>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
656
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
657 <refnamediv id='name.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
658 <refname>@PACKAGE@.conf</refname>
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
659 <refpurpose>configuration file for @PACKAGE@ sendmail milter</refpurpose>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
660 </refnamediv>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
661
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
662 <refsynopsisdiv id='synopsis.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
663 <title>Synopsis</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
664 <cmdsynopsis>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
665 <command>@PACKAGE@.conf</command>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
666 </cmdsynopsis>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
667 </refsynopsisdiv>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
668
108
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carl
parents: 104
diff changeset
669 <refsect1 id='description.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
670 <title>Description</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
671 <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
672 specified by this partial bnf description. Comments start with //
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
673 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
674 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
675 <literallayout class="monospaced"><![CDATA[include "<file>";]]></literallayout>
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
676 </para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
677
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
678 <literallayout class="monospaced"><![CDATA[
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
679 CONFIG = {CONTEXT ";"}+
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
680 CONTEXT = "context" NAME "{" {STATEMENT}+ "}"
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
681 STATEMENT = (DNSBL | DNSBLLIST | DNSWL | DNSWLLIST | CONTENT | ENV-TO
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
682 | VERIFY | GENERIC | W_REGEX | AUTOWHITE | CONTEXT | ENV-FROM
268
f941563c2a95 Add require_rdns checking
Carl Byington <carl@five-ten-sg.com>
parents: 263
diff changeset
683 | RATE-LIMIT | REQUIRERDNS) ";"
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
684
124
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
685 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
686 DNSBLLIST = "dnsbl_list" {NAME}*
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
687
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
688 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
689 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
690 LEVEL = INTEGER
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
691
268
f941563c2a95 Add require_rdns checking
Carl Byington <carl@five-ten-sg.com>
parents: 263
diff changeset
692 REQUIRERDNS = "require_rdns" ("yes" | "no")
f941563c2a95 Add require_rdns checking
Carl Byington <carl@five-ten-sg.com>
parents: 263
diff changeset
693
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
694 CONTENT = "content" ("on" | "off") "{" {CONTENT-ST}+ "}"
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
695 CONTENT-ST = (FILTER | URIBL | IGNORE | TLD | HTML-TAGS | HTML-LIMIT |
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
696 HOST-LIMIT | SPAMASS | REQUIRE | DCCGREY | DCCBULK) ";"
124
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
697 FILTER = "filter" DNSPREFIX ERROR-MSG2
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
698 URIBL = "uribl" DNSPREFIX ERROR-MSG3
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
699 IGNORE = "ignore" "{" {HOSTNAME [";"]}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
700 TLD = "tld" "{" {TLD [";"]}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
701 HTML-TAGS = "html_tags" "{" {HTMLTAG [";"]}+ "}"
124
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
702 ERROR-MSG1 = string containing exactly two %s replacement tokens
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
703 both are replaced with the client ip address
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
704 ERROR-MSG2 = string containing exactly two %s replacement tokens
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
705 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
706 is replaced with the ip address
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
707 ERROR-MSG3 = string containing exactly two %s replacement tokens
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
708 both are replaced with the hostname
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
709
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
710 HTML-LIMIT = "html_limit" ("on" INTEGER ERROR-MSG | "off")
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
711
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
712 HOST-LIMIT = "host_limit" ("on" INTEGER ERROR-MSG | "off" |
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
713 "soft" INTEGER)
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
714 SPAMASS = "spamassassin" INTEGER
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
715 REQUIRE = "require_match" ("yes" | "no")
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
716 DCCGREY = "dcc_greylist" ("yes" | "no")
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
717 DCCBULK = "dcc_bulk_threshold" (INTEGER | "many" | "off")
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 ENV-TO = "env_to" "{" {(TO-ADDR | DCC-TO)}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
720 TO-ADDR = ADDRESS [";"]
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
721 DCC-TO = "dcc_to" ("ok" | "many") "{" DCCINCLUDEFILE "}" ";"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
722
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
723 VERIFY = "verify" HOSTNAME ";"
168
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
724 GENERIC = "generic" REGULAREXPRESSION ERROR-MSG4 ";"
233
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
725 W-REGEX = "white_regex" REGULAREXPRESSION ";"
168
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
726 ERROR-MSG4 = string containing exactly one %s replacement token
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
727 which is replaced with the client name
153
8d7c439bb6fa add auto whitelisting
carl
parents: 152
diff changeset
728 AUTOWHITE = "autowhite" DAYS FILENAME ";"
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
729
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
730 ENV_FROM = "env_from" [DEFAULT] "{" {(FROM-ADDR | DCC-FROM)}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
731 FROM-ADDR = ADDRESS VALUE [";"]
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
732 DCC-FROM = "dcc_from" "{" DCCINCLUDEFILE "}" ";"
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
733
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
734 RATE-LIMIT = "rate_limit" [DEFAULT_LIMIT [DAILY_MULTIPLE]] "{" (RATE)+ "}"
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
735 RATE = USER LIMIT [";"]
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 LIMIT = INTEGER
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
737 DEFAULT_LIMIT = INTEGER
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 DAILY_MULTIPLE = INTEGER
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
739
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
740 DEFAULT = ("white" | "black" | "unknown" | "inherit" | "")
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
741 ADDRESS = (USER@ | DOMAIN | USER@DOMAIN)
148
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
742 VALUE = ("white" | "black" | "unknown" | "inherit" | CHILD-CONTEXT-NAME)]]></literallayout>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
743 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
744
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
745 <refsect1 id='sample.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
746 <title>Sample</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
747 <literallayout class="monospaced"><![CDATA[
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
748 context main-default {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
749 // 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
750 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
751 dnsbl_list sbl;
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
752
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
753 // outbound content filtering to prevent our own customers from sending spam
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
754 content on {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
755 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
756 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
757 #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
758 #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
759 ignore { include "hosts-ignore.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
760 tld { include "tld.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
761 html_tags { include "html-tags.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
762 html_limit on 20 "Mail containing excessive bad html tags rejected";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
763 html_limit off;
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
764 host_limit on 20 "Mail containing excessive host names rejected";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
765 host_limit soft 20;
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
766 spamassassin 4;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
767 require_match yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
768 dcc_greylist yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
769 dcc_bulk_threshold 50;
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
770 };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
771
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
772 // backscatter prevention - don't send bounces for mail that we accepted but could not forward
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
773 // we only send bounces to our own customers
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
774 env_from unknown {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
775 "<>" black;
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
776 };
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
777
259
be939802c64e add recipient rate limits by email from address or domain
Carl Byington <carl@five-ten-sg.com>
parents: 255
diff changeset
778 // hourly recipient rate limit by smtp auth client id,
be939802c64e add recipient rate limits by email from address or domain
Carl Byington <carl@five-ten-sg.com>
parents: 255
diff changeset
779 // or unauthenticated mail from address
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
780 // default hourly limit is 30
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
781 // daily limits are 4 times the hourly limit
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
782 rate_limit 30 4 { // default
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
783 #fred 100; // override default limits
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
784 #joe 10; // ""
263
e118fd2c6af0 fix unauthenticated rate limit bug for empty mail from; move unauthenticate rate limit checks after spam filtering
Carl Byington <carl@five-ten-sg.com>
parents: 261
diff changeset
785 #"sam@somedomain.tld" 500;
e118fd2c6af0 fix unauthenticated rate limit bug for empty mail from; move unauthenticate rate limit checks after spam filtering
Carl Byington <carl@five-ten-sg.com>
parents: 261
diff changeset
786 #"@otherdomain.tld" 100;
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
787 };
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
788 };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
789
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
790 context main {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
791 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
792 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
793 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
794 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
795 dnswl dnswl.org list.dnswl.org 2;
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
796 dnsbl_list local sbl;
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
797 dnswl_list dnswl.org;
268
f941563c2a95 Add require_rdns checking
Carl Byington <carl@five-ten-sg.com>
parents: 263
diff changeset
798 require_rdns yes;
94
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carl
parents: 92
diff changeset
799
108
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carl
parents: 104
diff changeset
800 content on {
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parents: 104
diff changeset
801 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
802 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
803 #uribl multi.uribl.com "Mail containing %s rejected - uribl; see http://l.uribl.com/?d=%s";
270
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parents: 268
diff changeset
804 #uribl dbl.spamhaus.org "Mail containing %s rejected - dbl; see http://www.spamhaus.org/query/domain?domain=%s";
108
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parents: 104
diff changeset
805 ignore { include "hosts-ignore.conf"; };
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carl
parents: 104
diff changeset
806 tld { include "tld.conf"; };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
807 html_tags { include "html-tags.conf"; };
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carl
parents: 104
diff changeset
808 html_limit off;
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carl
parents: 104
diff changeset
809 host_limit soft 20;
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
810 spamassassin 5;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
811 require_match yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
812 dcc_greylist yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
813 dcc_bulk_threshold 20;
108
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carl
parents: 104
diff changeset
814 };
94
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carl
parents: 92
diff changeset
815
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
816 generic "^dsl.static.*ttnet.net.tr$|(^|[x.-])(ppp|h|host)?([0-9]{1,3}[x.-](Red-|dynamic[x.-])?){4}"
171
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carl
parents: 170
diff changeset
817 "your mail server %s seems to have a generic name";
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
818
259
be939802c64e add recipient rate limits by email from address or domain
Carl Byington <carl@five-ten-sg.com>
parents: 255
diff changeset
819 white_regex "=example.com=user@yourhostingaccount.com$";
233
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
820
108
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carl
parents: 104
diff changeset
821 env_to {
171
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carl
parents: 170
diff changeset
822 # !! replace this with your domain names
108
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carl
parents: 104
diff changeset
823 # child contexts are not allowed to specify recipient addresses outside these domains
179
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carl
parents: 178
diff changeset
824 # if this is a backup-mx, you need to include here domains for which you relay to the primary mx
174
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carl
parents: 172
diff changeset
825 include "/etc/mail/local-host-names";
108
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carl
parents: 104
diff changeset
826 };
94
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carl
parents: 92
diff changeset
827
108
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carl
parents: 104
diff changeset
828 context whitelist {
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
829 content off {};
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carl
parents: 104
diff changeset
830 env_to {
171
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carl
parents: 170
diff changeset
831 # dcc_to ok { include "/var/dcc/whitecommon"; };
108
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carl
parents: 104
diff changeset
832 };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
833 env_from white {}; # white forces all unmatched from addresses (everyone in this case) to be whitelisted
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carl
parents: 104
diff changeset
834 # so all mail TO these env_to addresses is accepted
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carl
parents: 104
diff changeset
835 };
94
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carl
parents: 92
diff changeset
836
171
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carl
parents: 170
diff changeset
837 context abuse {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
838 dnsbl_list xbl;
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
839 content off {};
174
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carl
parents: 172
diff changeset
840 generic "^$ " " "; # regex cannot match, to disable generic rdns rejects
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
841 env_to {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
842 abuse@ # no content filtering on abuse reports
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
843 postmaster@ # ""
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
844 };
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
845 env_from unknown {}; # ignore all parent white/black listing
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
846 };
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
847
108
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carl
parents: 104
diff changeset
848 context minimal {
171
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carl
parents: 170
diff changeset
849 dnsbl_list sbl;
178
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carl
parents: 176
diff changeset
850 content on {
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
851 spamassassin 10;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
852 dcc_bulk_threshold many;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
853 };
171
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carl
parents: 170
diff changeset
854 generic "^$ " " "; # regex cannot match, to disable generic rdns rejects
108
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carl
parents: 104
diff changeset
855 env_to {
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
856 };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
857 };
94
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carl
parents: 92
diff changeset
858
108
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carl
parents: 104
diff changeset
859 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>
parents: 253
diff changeset
860 dnsbl_list ;
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
861 dnswl_list ;
108
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carl
parents: 104
diff changeset
862 env_to {
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
863 # dcc_to many { include "/var/dcc/whitecommon"; };
108
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carl
parents: 104
diff changeset
864 };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
865 env_from black {}; # black forces all unmatched from addresses (everyone in this case) to be blacklisted
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
866 # so all mail TO these env_to addresses is rejected
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
867 };
94
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carl
parents: 92
diff changeset
868
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
869 env_from unknown {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
870 abuse@ abuse; # replies to abuse reports use the abuse context
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
871 # dcc_from { include "/var/dcc/whitecommon"; };
108
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carl
parents: 104
diff changeset
872 };
1c7677042b78 move to autoconf/automake/docbook
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parents: 104
diff changeset
873
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
874 autowhite 90 "autowhite/my-auto-whitelist";
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
875 # install should create /etc/dnsbl/autowhite writable by userid dnsbl
108
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carl
parents: 104
diff changeset
876 };]]></literallayout>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
877 </refsect1>
94
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carl
parents: 92
diff changeset
878
111
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carl
parents: 108
diff changeset
879 <refsect1 id='version.5'>
201
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
880 <title>Version</title>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
881 <para>
201
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
882 @VERSION@
108
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carl
parents: 104
diff changeset
883 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
884 </refsect1>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
885
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
886 </refentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
887 </reference>