annotate xml/dnsbl.in @ 294:7fb5911fe3a4

allow broken SRS0+ rather than the correct SRS0= tag
author Carl Byington <carl@five-ten-sg.com>
date Fri, 18 Jul 2014 15:04:16 -0700
parents 896b9393d3f0
children 1f40b1b0ad31
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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>
284
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203 This milter can also impose hourly and daily limits on the number of
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204 different ip addresses used for SMTP AUTH connections. If a single
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205 user is connecting from too many different ip addresses, we presume that
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206 their authentication credentials have been discovered, and block their
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207 outgoing mail.
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208 </para>
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209 <para>
162
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210 Consider the case of a message from A to B passing thru this milter. If
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211 that message is not blocked, then we might eventually see a reply
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212 message from B to A. If the filtering context for A includes an
162
c4bce911c276 don't add auto whitelist for A to A
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213 autowhite entry, and that context does <emphasis>not</emphasis> cover B
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214 as a recipient, then this milter will add an entry in that file to
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215 whitelist such replies for a configurable time period. Suppose A and B
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216 are in the same domain, or at least use the same filtering context. In
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217 that case we don't want to add a whitelist entry for B, since that would
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218 then allow spammers to send mail from B (forged) to B. Such autowhite
160
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219 files need to be writeable by the dnsbl user, where all the other dnsbl
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220 configuration files only need to be readable by the dnsbl user.
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221 </para>
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222 <para>
176
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223 You can manually add such an autowhite entry, by appending a single
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224 text line to the autowhitelist file, using something like
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225 <command>echo "$mail 0" >>$autowhitefile</command>.
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226 You can manually remove such an autowhite entry, by appending a single
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227 text line to the autowhitelist file, using something like
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228 <command>echo "$mail 1" >>$autowhitefile</command>.
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229 </para>
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230 <para>
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231 The DNSBL milter reads a text configuration file (dnsbl.conf) on
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232 startup, and whenever the config file (or any of the referenced include
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233 files) is changed. The entire configuration file is case insensitive.
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234 If the configuration cannot be loaded due to a syntax error, the milter
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235 will log the error and quit. If the configuration cannot be reloaded
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236 after being modified, the milter will log the error and send an email to
152
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237 root from dnsbl@$hostname. You probably want to add dnsbl@$hostname
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238 to your /etc/mail/virtusertable since otherwise sendmail will reject
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239 that message.
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240 </para>
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241 </refsect1>
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242
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243 <refsect1 id='dcc.1'>
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244 <title>DCC Issues</title>
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245 <para>
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246 If you are also using the <ulink
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247 url="http://www.rhyolite.com/anti-spam/dcc/">DCC</ulink> milter, there
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248 are a few considerations. You may need to whitelist senders from the
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249 DCC bulk detector, or from the DNS based lists. Those are two very
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250 different reasons for whitelisting. The former is done thru the DCC
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251 whiteclnt config file, the later is done thru the DNSBL milter config
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252 file.
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253 </para>
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254 <para>
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255 You may want to blacklist some specific senders or sending domains.
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256 This could be done thru either the DCC (on a global basis, or for a
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257 specific single recipient). We prefer to do such blacklisting via the
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258 DNSBL milter config, since it can be done for a collection of recipient
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259 mail domains. The DCC approach has the feature that you can capture the
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260 entire message in the DCC log files. The DNSBL milter approach has the
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261 feature that the mail is rejected earlier (at RCPT TO time), and the
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262 sending machine just gets a generic "550 5.7.1 no such user" message.
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263 </para>
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264 <para>
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265 The DCC whiteclnt file can be included in the DNSBL milter config by the
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266 dcc_to and dcc_from statements. This will import the (env_to, env_from,
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267 and substitute mail_host) entries from the DCC config into the DNSBL
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268 config. This allows using the DCC config as the single point for
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269 white/blacklisting.
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270 </para>
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271 <para>
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272 Consider the case where you have multiple clients, each with their own
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273 mail servers, and each running their own DCC milters. Each client is
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274 using the DCC facilities for envelope from/to white/blacklisting.
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275 Presumably you can use rsync or scp to fetch copies of your clients DCC
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276 whiteclnt files on a regular basis. Your mail server, acting as a
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277 backup MX for your clients, can use the DNSBL milter, and include those
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278 client DCC config files. The envelope from/to white/blacklisting will
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279 be appropriately tagged and used only for the domains controlled by each
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280 of those clients.
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281 </para>
179
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282 <para>
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283 You can now use (via dccifd) different dcc filtering parameters on a per
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284 context basis. See the dcc_greylist and dcc_bulk_threshold statements
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285 in the <citerefentry> <refentrytitle>@PACKAGE@.conf</refentrytitle>
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286 <manvolnum>5</manvolnum> </citerefentry> configuration. Those
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287 statements are only active if you supply the <option>-b</option> option
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288 on the dnsbl command line. If you use the dcc via the standard dcc
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289 milter (dccm), then connections from clients that use SMTP AUTH are
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290 still subject to greylisting. If you use the dcc via dccifd and this
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291 milter, then connections from clients that use SMTP AUTH are never
180
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292 subject to greylisting. As part of this per-user greylisting, you need
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293 to move the dnsblnogrey file from the config directory to something
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294 like /var/dcc/userdirs/local/dnsblnogrey/whiteclnt so the dccifd will
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295 properly ignore greylisting for those recipients that don't want it.
179
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296 </para>
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297 </refsect1>
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298
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299 <refsect1 id='definitions.1'>
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300 <title>Definitions</title>
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301 <para>
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302 CONTEXT - a collection of parameters that defines the filtering context
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303 to be used for a collection of envelope recipient addresses. The
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304 context includes such things as the list of DNSBLs to be used, and the
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305 various content filtering parameters.
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306 </para>
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307 <para>
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308 DNSBL - a named DNS based blocking list is defined by a dns suffix (e.g.
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309 sbl-xbl.spamhaus.org) and a message string that is used to generate the
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310 "550 5.7.1" smtp error return code. The names of these DNSBLs will be
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311 used to define the DNSBL-LISTs.
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312 </para>
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313 <para>
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314 DNSBL-LIST - a named list of DNSBLs that will be used for specific
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315 recipients or recipient domains.
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316 </para>
249
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317 <para>
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318 DNSWL - a named DNS based white list is defined by a dns suffix (e.g.
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diff changeset
319 list.dnswl.org) and an integer level. If the level is greater than or
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diff changeset
320 equal to x in the 127.0.z.x return code from the white list, then the
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321 ip address is considered to match, and the message will be whitelisted.
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322 The names of these DNSWLs will be used to define the DNSWL-LISTs.
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323 </para>
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324 <para>
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325 DNSWL-LIST - a named list of DNSWLs that will be used for specific
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326 recipients or recipient domains.
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327 </para>
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328 </refsect1>
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329
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330 <refsect1 id='filtering.1'>
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331 <title>Filtering Procedure</title>
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332 <para>
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333 The SMTP envelope 'from' and 'to' values are used in various checks.
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334 The first check is to see if a reply message (swapping the env_from and
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335 env_to values) would be unconditionally blocked (just based on the
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336 envelope from address). That check is similar to the main check
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337 described below, but there is no body content to be scanned, and there
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338 is no client connection ip address to be checked against DNSBLs. If
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339 such a reply message would be blocked, we also block the original
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340 outgoing message. This prevents folks from sending mail to recipients
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341 that are unable to reply.
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342 </para>
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343 <para>
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344 If the client has authenticated with sendmail, the recipient rate limits
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345 and connection ip address limits are
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346 checked. If the authenticated user has not exceeded the hourly or daily rate
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347 limits, then the mail is accepted, the filtering contexts are not used,
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348 the dns lists are not checked, and the body content is not scanned. These
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349 rate limits can also be applied to unauthenticated connections, in which case
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350 the envelope from value is used as the authentication id for lookup purposes.
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351 If
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352 the client has not authenticated with sendmail, we follow these steps
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353 for each recipient.
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354 </para>
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355 <orderedlist>
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356 <listitem><para>
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357 The envelope to email address is used to find an initial filtering
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358 context. We first look for a context that specified the full email
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359 address in the env_to statement. If that is not found, we look for a
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360 context that specified the entire domain name of the envelope recipient
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361 in the env_to statement. If that is not found, we look for a context
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362 that specified the user@ part of the envelope recipient in the env_to
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363 statement. If that is not found, we use the first top level context
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364 defined in the config file.
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365 </para></listitem>
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366 <listitem><para>
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367 The initial filtering context may redirect to a child context based on
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368 the values in the initial context's env_from statement. We look for [1)
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369 the full envelope from email address, 2) the domain name part of the
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370 envelope from address, 3) the user@ part of the envelope from address]
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371 in that context's env_from statement, with values that point to a child
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372 context. If such an entry is found, we switch to that child filtering
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373 context.
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374 </para></listitem>
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375 <listitem><para>
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376 We lookup [1) the full envelope from email address, 2) the domain name
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377 part of the envelope from address, 3) the user@ part of the envelope
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378 from address] in the filtering context env_from statement. That results
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379 in one of (white, black, unknown, inherit).
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380 </para></listitem>
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381 <listitem><para>
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382 If the answer is black, mail to this recipient is rejected with "no such
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383 user", and the dns lists are not checked.
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384 </para></listitem>
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385 <listitem><para>
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386 If the answer is white, mail to this recipient is accepted and the dns
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387 lists are not checked.
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388 </para></listitem>
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389 <listitem><para>
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390 If the answer is unknown, we don't reject yet, but the dns lists will be
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391 checked, and the content may be scanned.
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392 </para></listitem>
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393 <listitem><para>
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394 If the answer is inherit, we repeat the envelope from search in the
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395 parent context.
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396 </para></listitem>
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397 <listitem><para>
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398 If the mail has not been accepted or rejected yet, and the filtering
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399 context (or any ancestor context) specifies a non-empty whitelist regular
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400 expression, then we check the envelope from value against that regex.
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401 The mail is accepted if the envelope from value matches the specified regular
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402 expression.
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403 </para></listitem>
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404 <listitem><para>
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405 If the mail has not been accepted or rejected yet, the dns white lists
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406 specified in the filtering context are checked and the mail is accepted
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407 if any list has an A record for the standard dns based lookup scheme
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408 (reversed octets of the client followed by the dns suffix) with a final
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409 octet greater than or equal to the level specified for that dnswl.
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410 </para></listitem>
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411 <listitem><para>
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412 If the mail has not been accepted or rejected yet, the dns black lists
168
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413 specified in the filtering context are checked and the mail is rejected
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414 if any list has an A record for the standard dns based lookup scheme
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415 (reversed octets of the client followed by the dns suffix).
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416 </para></listitem>
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417 <listitem><para>
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418 If the mail has not been accepted or rejected yet, and the filtering
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419 context (or any ancestor context) requires matching reverse dns client
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420 name, the mail is rejected if the client name is empty or forged.
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421 </para></listitem>
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422 <listitem><para>
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423 If the mail has not been accepted or rejected yet, and the filtering
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424 context (or any ancestor context) specifies a non-empty generic regular
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425 expression, then we check the fully qualified client name (obtained via
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426 the sendmail macro "_"). The mail is rejected if the client name
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427 matches the specified regular expression.
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428 </para></listitem>
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429 <listitem><para>
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430 If the mail has not been accepted or rejected yet, we look for a
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parents: 104
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431 verification context, which is the closest ancestor of the filtering
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432 context that both specifies a verification host, and which covers the
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433 envelope to address. If we find such a verification context, and the
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434 verification host is not our own hostname, we open an smtp conversation
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435 with that verification host. The current envelope from and recipient to
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436 values are passed to that verification host. If we receive a 5xy
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437 response those commands, we reject the current recipient with "no such
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438 user".
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439 </para></listitem>
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440 <listitem><para>
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441 If the mail has not been accepted or rejected yet, and the filtering
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442 context enables content filtering, and this is the first such recipient
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443 in this smtp transaction, we set the content filtering parameters from
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444 this context, and enable content filtering for the body of this message.
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445 </para></listitem>
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446 </orderedlist>
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447 <para>
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448 For each recipient that was accepted, we search for an autowhite entry
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449 starting in the reply filtering context. If an autowhite entry is found,
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450 we add the recipient to that auto whitelist file. This will prevent reply
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451 messages from being blocked by the dnsbl or content filtering.
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452 </para>
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453 <para>
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454 If content filtering is enabled for this body, the mail text is decoded
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parents: 115
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455 (uuencode, base64, mime, html entity, url encodings), and scanned for HTTP
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
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parents: 115
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456 and HTTPS URLs or bare host names. Hostnames must be either ip address
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parents: 115
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457 literals, or must end in a string defined by the TLD list. The first
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parents: 115
diff changeset
458 &lt;configurable&gt; host names are checked as follows.
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parents: 115
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459 </para>
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diff changeset
460 <para>
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parents: 115
diff changeset
461 The only known list that is suitable for the content filter DNSBL is the
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carl
parents: 115
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462 SBL. If the content filter DNSBL is defined, and any of those host
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
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parents: 115
diff changeset
463 names resolve to ip addresses that are on that DNSBL (or have
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carl
parents: 115
diff changeset
464 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
465 &lt;configurable&gt; ignore list, the mail is rejected.
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carl
parents: 115
diff changeset
466 </para>
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parents: 115
diff changeset
467 <para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
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parents: 115
diff changeset
468 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
469 on that DNSBL, and the host name is not on the &lt;configurable&gt;
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diff changeset
470 ignore list, the mail is rejected. There are three lists that are suitable
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diff changeset
471 here, URIBL, SURBL, and DBL.
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parents: 115
diff changeset
472 </para>
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parents: 115
diff changeset
473 <para>
167
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parents: 164
diff changeset
474 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.
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parents: 164
diff changeset
475 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.
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parents: 164
diff changeset
476 spamc), and the message is rejected for those recipients with spamassassin
203
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
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parents: 201
diff changeset
477 limits less than the resulting spamassassin score. For example, a
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
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parents: 201
diff changeset
478 spamassassin limit of three will reject messages with spamassassin scores
246
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parents: 233
diff changeset
479 of four or greater. If the filtering context has a spamassassin limit of
8b0f16abee53 Add prvs decoding to envelope addresses
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parents: 233
diff changeset
480 zero, then spamassassin is not called (or if called the results are not used)
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481 for this recipient.
203
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parents: 201
diff changeset
482 </para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
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parents: 201
diff changeset
483 <para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
484 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
485 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
486 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
487 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
488 </para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
489 <para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
490 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
491 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
492 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
493 than or equal to the DCC bulk score.
163
97d7da45fe2a spamassassin changes
carl
parents: 162
diff changeset
494 </para>
97d7da45fe2a spamassassin changes
carl
parents: 162
diff changeset
495 <para>
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
496 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
497 limit is exceeded, the mail is rejected.
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
498 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
499 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
500
111
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carl
parents: 108
diff changeset
501 <refsect1 id='access.1'>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
502 <title>Sendmail access vs. DNSBL</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
503 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
504 With the standard sendmail.mc dnsbl FEATURE, the dnsbl checks may be
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
505 suppressed by entries in the /etc/mail/access database. For example,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
506 suppose you control a /18 of address space, and have allocated some /24s
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
507 to some clients. You have access entries like
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
508 <literallayout class="monospaced"><![CDATA[
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
509 192.168.4 OK
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
510 192.168.17 OK]]></literallayout>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
511 </para>
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 to allow those clients to smarthost thru your mail server. Now if one
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
514 of those clients happens get infected with a virus that turns a machine
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
515 into an open proxy, and their 192.168.4.45 lands on the SBL-XBL, you
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
516 will still wind up allowing that infected machine to smarthost thru your
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
517 mail servers.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
518 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
519 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
520 With this DNSBL milter, the sendmail access database cannot override the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
521 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
522 smarthost mail server (unless the virus/proxy can use smtp-auth).
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 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
525 Using the standard sendmail features, you would add access entries to
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
526 allow hosts on your local network to relay thru your mail server. Those
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
527 OK entries in the sendmail access database will override all the dnsbl
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
528 checks. With this DNSBL milter, you will need to have the local users
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
529 authenticate with smtp-auth to get the same effect. You might find
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
530 <ulink
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
531 url="http://www.ists.dartmouth.edu/classroom/sendmail-ssl-how-to.php">
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
532 these directions</ulink> helpful for setting up smtp-auth if you are on
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
533 RH Linux.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
534 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
535 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
536
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
537 <refsect1 id='performance.1'>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
538 <title>Performance Issues</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
539 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
540 Consider a high volume high performance machine running sendmail. Each
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
541 sendmail process can do its own dns resolution. Typically, such dns
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
542 resolver libraries are not thread safe, and so must be protected by some
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
543 sort of mutex in a threaded environment. When we add a milter to
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
544 sendmail, we now have a collection of sendmail processes, and a
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
545 collection of milter threads.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
546 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
547 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
548 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
549 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
550 serialized inside the milter, we have an upper limit of about 25K mail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
551 messages per day. That is clearly not sufficient for many sites.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
552 </para>
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 Since we want to do parallel dns resolution across those milter threads,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
555 we add another collection of dns resolver processes. Each sendmail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
556 process is talking to a milter thread over a socket, and each milter
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
557 thread is talking to a dns resolver process over another socket.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
558 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
559 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
560 Suppose we are processing 20 messages per second, and each message
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
561 requires 20 seconds of dns work. Then we will have 400 sendmail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
562 processes, 400 milter threads, and 400 dns resolver processes. Of
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
563 course that steady state is very unlikely to happen.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
564 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
565 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
566
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
567
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
568 <refsect1 id='rejected.1'>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
569 <title>Rejected Ideas</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
570 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
571 The following ideas have been considered and rejected.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
572 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
573 <para>
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
574 Add max_recipients setting to the context configuration. Recipients in
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
575 excess of that limit will be rejected, and all the non-whitelisted
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
576 recipients will be removed. Current spammers *very* rarely send more
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
577 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
578 significant amount of spam.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
579 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
580 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
581 Add poison addresses to the configuration. If any recipient is
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
582 poison, all recipients are rejected even if they would be whitelisted,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
583 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
584 addresses that would be suitable for such use. Based on my log files,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
585 any mail to those spam trap addresses is rejected based on either dnsbl
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
586 lookups or the DCC. So this won't result in blocking any additional
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
587 spam.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
588 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
589 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
590 Add an option to only allow one recipient if the return path is
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
591 empty. Based on my log files, there is no mail that violates this
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
592 check.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
593 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
594 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
595 Reject the mail if the envelope from domain name contains any MX
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
596 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
597 spam sent with such domain names.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
598 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
599 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
600
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
601 <refsect1 id='todo.1'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
602 <title>TODO</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
603 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
604 The following ideas are under consideration.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
605 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
606 <para>
276
19ff60eaab74 more tld entries
Carl Byington <carl@five-ten-sg.com>
parents: 270
diff changeset
607 Add config switch to require the HELO argument to resolve to an ip address.
19ff60eaab74 more tld entries
Carl Byington <carl@five-ten-sg.com>
parents: 270
diff changeset
608 </para>
19ff60eaab74 more tld entries
Carl Byington <carl@five-ten-sg.com>
parents: 270
diff changeset
609 <para>
270
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
Carl Byington <carl@five-ten-sg.com>
parents: 268
diff changeset
610 Add white/unknown to config for smtp authenticated connections. Currently
284
896b9393d3f0 Fix segfault caused by freeing unallocated memory
Carl Byington <carl@five-ten-sg.com>
parents: 278
diff changeset
611 any authenticated connection is fully whitelisted. The only spam control
896b9393d3f0 Fix segfault caused by freeing unallocated memory
Carl Byington <carl@five-ten-sg.com>
parents: 278
diff changeset
612 on those connections is rate limiting. This feature would allow content based
270
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
Carl Byington <carl@five-ten-sg.com>
parents: 268
diff changeset
613 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
614 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
615 </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
616 <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
617 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
618 authenticated connections. User abc could be restricted to envelope from
f92f24950bd3 Use mozilla prefix list for tld checking, Enable surbl/uribl/dbl rhs lists
Carl Byington <carl@five-ten-sg.com>
parents: 268
diff changeset
619 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
620 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
621 </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
622 <para>
115
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
623 Look for href="hostname/path" strings that are missing the required
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
624 http:// protocol header. Such references are still clickable in common
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
625 mail software.
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
626 </para>
278
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
627 <para>
284
896b9393d3f0 Fix segfault caused by freeing unallocated memory
Carl Byington <carl@five-ten-sg.com>
parents: 278
diff changeset
628 Add spf to the white/black/unknown values in env_from blocks. This
896b9393d3f0 Fix segfault caused by freeing unallocated memory
Carl Byington <carl@five-ten-sg.com>
parents: 278
diff changeset
629 results in whitelisting that envelope from value as long as the connection
896b9393d3f0 Fix segfault caused by freeing unallocated memory
Carl Byington <carl@five-ten-sg.com>
parents: 278
diff changeset
630 is made from an ip address listed in the domain spf txt record.
278
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
631 </para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
632 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
633
111
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carl
parents: 108
diff changeset
634 <refsect1 id='copyright.1'>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
635 <title>Copyright</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
636 <para>
261
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
637 Copyright (C) 2012 by 510 Software Group &lt;carl@five-ten-sg.com&gt;
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
638 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
639 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
640 This program is free software; you can redistribute it and/or modify it
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
641 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
642 Free Software Foundation; either version 3, or (at your option) any
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
643 later version.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
644 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
645 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
646 You should have received a copy of the GNU General Public License along
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
647 with this program; see the file COPYING. If not, please write to the
1c7677042b78 move to autoconf/automake/docbook
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parents: 104
diff changeset
648 Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
649 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
650 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
651
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
652 <refsect1 id='version.1'>
201
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
653 <title>Version</title>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
654 <para>
201
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
655 @VERSION@
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
656 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
657 </refsect1>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
658 </refentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
659
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
660
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
661 <refentry id="@PACKAGE@.conf.5">
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
662 <refentryinfo>
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
663 <date>2013-05-22</date>
261
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
664 <author>
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
665 <firstname>Carl</firstname>
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
666 <surname>Byington</surname>
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
667 <affiliation><orgname>510 Software Group</orgname></affiliation>
92a98e661a0b update documentation for newer xml dtd
Carl Byington <carl@five-ten-sg.com>
parents: 259
diff changeset
668 </author>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
669 </refentryinfo>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
670
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
671 <refmeta>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
672 <refentrytitle>@PACKAGE@.conf</refentrytitle>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
673 <manvolnum>5</manvolnum>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
674 <refmiscinfo>@PACKAGE@ @VERSION@</refmiscinfo>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
675 </refmeta>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
676
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
677 <refnamediv id='name.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
678 <refname>@PACKAGE@.conf</refname>
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
679 <refpurpose>configuration file for @PACKAGE@ sendmail milter</refpurpose>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
680 </refnamediv>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
681
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
682 <refsynopsisdiv id='synopsis.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
683 <title>Synopsis</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
684 <cmdsynopsis>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
685 <command>@PACKAGE@.conf</command>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
686 </cmdsynopsis>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
687 </refsynopsisdiv>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
688
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
689 <refsect1 id='description.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
690 <title>Description</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
691 <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
692 specified by this partial bnf description. Comments start with //
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
693 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
694 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
695 <literallayout class="monospaced"><![CDATA[include "<file>";]]></literallayout>
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
696 </para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
697
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
698 <literallayout class="monospaced"><![CDATA[
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
699 CONFIG = {CONTEXT ";"}+
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
700 CONTEXT = "context" NAME "{" {STATEMENT}+ "}"
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
701 STATEMENT = (DNSBL | DNSBLLIST | DNSWL | DNSWLLIST | CONTENT | ENV-TO
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
702 | 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
703 | RATE-LIMIT | REQUIRERDNS) ";"
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
704
124
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
705 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
706 DNSBLLIST = "dnsbl_list" {NAME}*
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
707
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
708 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
709 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
710 LEVEL = INTEGER
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
711
268
f941563c2a95 Add require_rdns checking
Carl Byington <carl@five-ten-sg.com>
parents: 263
diff changeset
712 REQUIRERDNS = "require_rdns" ("yes" | "no")
f941563c2a95 Add require_rdns checking
Carl Byington <carl@five-ten-sg.com>
parents: 263
diff changeset
713
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
714 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
715 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
716 HOST-LIMIT | SPAMASS | REQUIRE | DCCGREY | DCCBULK) ";"
124
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
717 FILTER = "filter" DNSPREFIX ERROR-MSG2
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
718 URIBL = "uribl" DNSPREFIX ERROR-MSG3
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
719 IGNORE = "ignore" "{" {HOSTNAME [";"]}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
720 TLD = "tld" "{" {TLD [";"]}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
721 HTML-TAGS = "html_tags" "{" {HTMLTAG [";"]}+ "}"
124
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
722 ERROR-MSG1 = string containing exactly two %s replacement tokens
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
723 both are replaced with the client ip address
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
724 ERROR-MSG2 = string containing exactly two %s replacement tokens
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
725 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
726 is replaced with the ip address
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
727 ERROR-MSG3 = string containing exactly two %s replacement tokens
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
728 both are replaced with the hostname
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 HTML-LIMIT = "html_limit" ("on" INTEGER ERROR-MSG | "off")
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
731
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
732 HOST-LIMIT = "host_limit" ("on" INTEGER ERROR-MSG | "off" |
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
733 "soft" INTEGER)
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
734 SPAMASS = "spamassassin" INTEGER
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
735 REQUIRE = "require_match" ("yes" | "no")
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
736 DCCGREY = "dcc_greylist" ("yes" | "no")
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
737 DCCBULK = "dcc_bulk_threshold" (INTEGER | "many" | "off")
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
738
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
739 ENV-TO = "env_to" "{" {(TO-ADDR | DCC-TO)}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
740 TO-ADDR = ADDRESS [";"]
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
741 DCC-TO = "dcc_to" ("ok" | "many") "{" DCCINCLUDEFILE "}" ";"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
742
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
743 VERIFY = "verify" HOSTNAME ";"
168
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
744 GENERIC = "generic" REGULAREXPRESSION ERROR-MSG4 ";"
233
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
745 W-REGEX = "white_regex" REGULAREXPRESSION ";"
168
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
746 ERROR-MSG4 = string containing exactly one %s replacement token
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
747 which is replaced with the client name
153
8d7c439bb6fa add auto whitelisting
carl
parents: 152
diff changeset
748 AUTOWHITE = "autowhite" DAYS FILENAME ";"
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
749
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
750 ENV_FROM = "env_from" [DEFAULT] "{" {(FROM-ADDR | DCC-FROM)}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
751 FROM-ADDR = ADDRESS VALUE [";"]
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
752 DCC-FROM = "dcc_from" "{" DCCINCLUDEFILE "}" ";"
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
753
278
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
754 RATE-LIMIT = "rate_limit" DEFAULT_RCPT_LIMIT DAILY_MULTIPLE_RCPT
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
755 DEFAULT_IP_LIMIT DAILY_MULTIPLE_IP "{" (RATE)+ "}"
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
756 RATE = USER RCPTLIMIT IPLIMIT ";"
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
757 RCPTLIMIT = INTEGER
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
758 DEFAULT_RCPT_LIMIT = INTEGER
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
759 DAILY_MULTIPLE_RCPT = INTEGER
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
760 DEFAULT_IP_LIMIT = INTEGER
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
761 DAILY_MULTIPLE_IP = INTEGER
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
762
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
763 DEFAULT = ("white" | "black" | "unknown" | "inherit" | "")
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
764 ADDRESS = (USER@ | DOMAIN | USER@DOMAIN)
148
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
765 VALUE = ("white" | "black" | "unknown" | "inherit" | CHILD-CONTEXT-NAME)]]></literallayout>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
766 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
767
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
768 <refsect1 id='sample.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
769 <title>Sample</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
770 <literallayout class="monospaced"><![CDATA[
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
771 context main-default {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
772 // 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
773 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
774 dnsbl_list sbl;
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
775
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
776 // outbound content filtering to prevent our own customers from sending spam
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
777 content on {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
778 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
779 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
780 #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
781 #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
782 ignore { include "hosts-ignore.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
783 tld { include "tld.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
784 html_tags { include "html-tags.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
785 html_limit on 20 "Mail containing excessive bad html tags rejected";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
786 html_limit off;
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
787 host_limit on 20 "Mail containing excessive host names rejected";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
788 host_limit soft 20;
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
789 spamassassin 4;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
790 require_match yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
791 dcc_greylist yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
792 dcc_bulk_threshold 50;
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
793 };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
794
278
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
795 // backscatter prevention - do not send bounces for mail that we accepted but could not forward
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
796 // we only send bounces to our own customers
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
797 env_from unknown {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
798 "<>" black;
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
799 };
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
800
278
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
801 // hourly recipient rate limit by smtp auth client id, or unauthenticated mail from address
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
802 // hourly unique ip addresses by smtp auth client id, or unauthenticated mail from address
284
896b9393d3f0 Fix segfault caused by freeing unallocated memory
Carl Byington <carl@five-ten-sg.com>
parents: 278
diff changeset
803 // default hourly recipient rate limit is 30
896b9393d3f0 Fix segfault caused by freeing unallocated memory
Carl Byington <carl@five-ten-sg.com>
parents: 278
diff changeset
804 // daily recipient rate limits are 4 times the hourly limit
278
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
805 // default hourly unique ip addresses is 5
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
806 // daily unique ip addresses are 4 times the hourly limit
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
807 rate_limit 30 4 5 4 { // default
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
808 fred 100 10; // override default limits
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
809 joe 10 2; // ""
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
810 "sam@somedomain.tld" 500 2;
368572c57013 add limits on unique ip addresses per hour per authenticated user
Carl Byington <carl@five-ten-sg.com>
parents: 276
diff changeset
811 "@otherdomain.tld" 100 2;
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
812 };
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
813 };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
814
171
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carl
parents: 170
diff changeset
815 context main {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
816 dnsbl localp partial.blackholes.five-ten-sg.com "Mail from %s rejected - local; see http://www.five-ten-sg.com/blackhole.php?%s";
108
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parents: 104
diff changeset
817 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
818 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
819 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
820 dnswl dnswl.org list.dnswl.org 2;
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
821 dnsbl_list local sbl;
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
822 dnswl_list dnswl.org;
268
f941563c2a95 Add require_rdns checking
Carl Byington <carl@five-ten-sg.com>
parents: 263
diff changeset
823 require_rdns yes;
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
824
108
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carl
parents: 104
diff changeset
825 content on {
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carl
parents: 104
diff changeset
826 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
827 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
828 #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
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parents: 268
diff changeset
829 #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
830 ignore { include "hosts-ignore.conf"; };
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carl
parents: 104
diff changeset
831 tld { include "tld.conf"; };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
832 html_tags { include "html-tags.conf"; };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
833 html_limit off;
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
834 host_limit soft 20;
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
835 spamassassin 5;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
836 require_match yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
837 dcc_greylist yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
838 dcc_bulk_threshold 20;
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
839 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
840
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
841 generic "^dsl.static.*ttnet.net.tr$|(^|[x.-])(ppp|h|host)?([0-9]{1,3}[x.-](Red-|dynamic[x.-])?){4}"
171
8deb51871b3d fix pre/post scripts in rpm spec file
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parents: 170
diff changeset
842 "your mail server %s seems to have a generic name";
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
843
259
be939802c64e add recipient rate limits by email from address or domain
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parents: 255
diff changeset
844 white_regex "=example.com=user@yourhostingaccount.com$";
233
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
845
108
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parents: 104
diff changeset
846 env_to {
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
847 # !! replace this with your domain names
108
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carl
parents: 104
diff changeset
848 # child contexts are not allowed to specify recipient addresses outside these domains
179
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
849 # if this is a backup-mx, you need to include here domains for which you relay to the primary mx
174
da0c41b9f672 don't whitelist addresses with embedded spaces
carl
parents: 172
diff changeset
850 include "/etc/mail/local-host-names";
108
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carl
parents: 104
diff changeset
851 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
852
108
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carl
parents: 104
diff changeset
853 context whitelist {
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
854 content off {};
1c7677042b78 move to autoconf/automake/docbook
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parents: 104
diff changeset
855 env_to {
171
8deb51871b3d fix pre/post scripts in rpm spec file
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parents: 170
diff changeset
856 # dcc_to ok { include "/var/dcc/whitecommon"; };
108
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carl
parents: 104
diff changeset
857 };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
858 env_from white {}; # white forces all unmatched from addresses (everyone in this case) to be whitelisted
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
859 # so all mail TO these env_to addresses is accepted
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
860 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
861
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
862 context abuse {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
863 dnsbl_list xbl;
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
864 content off {};
174
da0c41b9f672 don't whitelist addresses with embedded spaces
carl
parents: 172
diff changeset
865 generic "^$ " " "; # regex cannot match, to disable generic rdns rejects
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
866 env_to {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
867 abuse@ # no content filtering on abuse reports
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
868 postmaster@ # ""
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
869 };
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
870 env_from unknown {}; # ignore all parent white/black listing
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
871 };
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
872
108
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parents: 104
diff changeset
873 context minimal {
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
874 dnsbl_list sbl;
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
875 content on {
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
876 spamassassin 10;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
877 dcc_bulk_threshold many;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
878 };
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
879 generic "^$ " " "; # regex cannot match, to disable generic rdns rejects
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
880 env_to {
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
881 };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
882 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
883
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
884 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
885 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
886 dnswl_list ;
108
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carl
parents: 104
diff changeset
887 env_to {
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
888 # dcc_to many { include "/var/dcc/whitecommon"; };
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
889 };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
890 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
891 # so all mail TO these env_to addresses is rejected
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
892 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
893
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
894 env_from unknown {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
895 abuse@ abuse; # replies to abuse reports use the abuse context
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
896 # dcc_from { include "/var/dcc/whitecommon"; };
108
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carl
parents: 104
diff changeset
897 };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
898
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
899 autowhite 90 "autowhite/my-auto-whitelist";
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
900 # install should create /etc/dnsbl/autowhite writable by userid dnsbl
108
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carl
parents: 104
diff changeset
901 };]]></literallayout>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
902 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
903
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
904 <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
905 <title>Version</title>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
906 <para>
201
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
907 @VERSION@
108
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carl
parents: 104
diff changeset
908 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
909 </refsect1>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
910
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
911 </refentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
912 </reference>