annotate xml/dnsbl.in @ 251:0a2b842c07cd

Added tag stable-6-0-29 for changeset 3218ab6af599
author Carl Byington <carl@five-ten-sg.com>
date Sun, 08 Apr 2012 11:56:00 -0700
parents 15bf4f68a0b2
children 2d6ecd03bbbe
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
1 <reference>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
2 <title>@PACKAGE@ Sendmail milter - Version @VERSION@</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
3 <partintro>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
4 <title>Packages</title>
201
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
5
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
6 <para>The various source and binary packages are available at <ulink
201
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
7 url="http://www.five-ten-sg.com/@PACKAGE@/packages/">http://www.five-ten-sg.com/@PACKAGE@/packages/</ulink>.
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
8 The most recent documentation is available at <ulink
201
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
9 url="http://www.five-ten-sg.com/@PACKAGE@/">http://www.five-ten-sg.com/@PACKAGE@/</ulink>.
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
10 </para>
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
11
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
12 <para>A <ulink
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
13 url="http://www.selenic.com/mercurial/wiki/">Mercurial</ulink> source
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
14 code repository for this project is available at <ulink
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
15 url="http://hg.five-ten-sg.com/@PACKAGE@/">http://hg.five-ten-sg.com/@PACKAGE@/</ulink>.
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
16 </para>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
17
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
18 </partintro>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
19
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
20 <refentry id="@PACKAGE@.1">
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
21 <refentryinfo>
233
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
22 <date>2009-05-25</date>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
23 </refentryinfo>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
24
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
25 <refmeta>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
26 <refentrytitle>@PACKAGE@</refentrytitle>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
27 <manvolnum>1</manvolnum>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
28 <refmiscinfo>@PACKAGE@ @VERSION@</refmiscinfo>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
29 </refmeta>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
30
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
31 <refnamediv id='name.1'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
32 <refname>@PACKAGE@</refname>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
33 <refpurpose>a sendmail milter with per-user dnsbl filtering</refpurpose>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
34 </refnamediv>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
35
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
36 <refsynopsisdiv id='synopsis.1'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
37 <title>Synopsis</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
38 <cmdsynopsis>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
39 <command>@PACKAGE@</command>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
40 <arg><option>-c</option></arg>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
41 <arg><option>-s</option></arg>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
42 <arg><option>-d <replaceable class="parameter">n</replaceable></option></arg>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
43 <arg><option>-e <replaceable class="parameter">from|to</replaceable></option></arg>
179
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
44 <arg><option>-b <replaceable class="parameter">local-domain-socket</replaceable></option></arg>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
45 <arg><option>-r <replaceable class="parameter">local-domain-socket</replaceable></option></arg>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
46 <arg><option>-p <replaceable class="parameter">sendmail-socket</replaceable></option></arg>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
47 <arg><option>-t <replaceable class="parameter">timeout</replaceable></option></arg>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
48 </cmdsynopsis>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
49 </refsynopsisdiv>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
50
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
51 <refsect1 id='options.1'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
52 <title>Options</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
53 <variablelist>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
54 <varlistentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
55 <term>-c</term>
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
56 <listitem><para>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
57 Load the configuration file, print a cannonical form
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
58 of the configuration on stdout, and exit.
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
59 </para></listitem>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
60 </varlistentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
61 <varlistentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
62 <term>-s</term>
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
63 <listitem><para>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
64 Stress test the configuration loading code by repeating
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
65 the load/free cycle in an infinite loop.
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
66 </para></listitem>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
67 </varlistentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
68 <varlistentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
69 <term>-d <replaceable class="parameter">n</replaceable></term>
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
70 <listitem><para>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
71 Set the debug level to <replaceable class="parameter">n</replaceable>.
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
72 </para></listitem>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
73 </varlistentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
74 <varlistentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
75 <term>-e <replaceable class="parameter">from|to</replaceable></term>
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
76 <listitem><para>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
77 Print the results of looking up the from and to addresses in the
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
78 current configuration. The | character is used to separate the from and to
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
79 addresses in the argument to the -e switch.
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
80 </para></listitem>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
81 </varlistentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
82 <varlistentry>
179
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
83 <term>-b <replaceable class="parameter">local-domain-socket-file-name</replaceable></term>
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
84 <listitem><para>
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
85 Set the local socket used for the connection to the dccifd daemon.
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
86 This is typically /var/dcc/dccifd.
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
87 </para></listitem>
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
88 </varlistentry>
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
89 <varlistentry>
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
90 <term>-r <replaceable class="parameter">local-domain-socket-file-name</replaceable></term>
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
91 <listitem><para>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
92 Set the local socket used for the connection to our own dns resolver processes.
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
93 </para></listitem>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
94 </varlistentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
95 <varlistentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
96 <term>-p <replaceable class="parameter">sendmail-socket</replaceable></term>
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
97 <listitem><para>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
98 Set the socket used for the milter connection to sendmail. This is either
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
99 "inet:port@ip-address" or "local:local-domain-socket-file-name".
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
100 </para></listitem>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
101 </varlistentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
102 <varlistentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
103 <term>-t <replaceable class="parameter">timeout</replaceable></term>
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
104 <listitem><para>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
105 Set the timeout in seconds used for communication with sendmail.
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
106 </para></listitem>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
107 </varlistentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
108 </variablelist>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
109 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
110
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
111 <refsect1 id='usage.1'>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
112 <title>Usage</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
113 <para><command>@PACKAGE@</command> -c</para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
114 <para><command>@PACKAGE@</command> -s</para>
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
115 <para><command>@PACKAGE@</command> -e 'someone@aol.com|localname@mydomain.tld'</para>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
116 <para><command>@PACKAGE@</command> -d 10 -r resolver.sock -p local:dnsbl.sock</para>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
117 </refsect1>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
118
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
119 <refsect1 id='installation.1'>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
120 <title>Installation</title>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
121 <para>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
122 This is now a standard GNU autoconf/automake installation, so the normal
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
123 "./configure; make; su; make install" works. "make chkconfig" will
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
124 setup the init.d runlevel scripts. Alternatively, you can use the
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
125 source or binary RPMs at <ulink
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
126 url="http://www.five-ten-sg.com/@PACKAGE@/packages">http://www.five-ten-sg.com/@PACKAGE@/packages</ulink>.
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
127 </para>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
128 <para>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
129 Note that this has ONLY been tested on Linux, specifically RedHat Linux.
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
130 In particular, this milter makes no attempt to understand IPv6. Your
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
131 mileage will vary. You will need at a minimum a C++ compiler with a
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
132 minimally thread safe STL implementation. The distribution includes a
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
133 test.cpp program. If it fails this milter won't work. If it passes,
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
134 this milter might work.
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
135 </para>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
136 <para>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
137 Modify your sendmail.mc by removing all the "FEATURE(dnsbl" lines, add
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
138 the following line in your sendmail.mc and rebuild the .cf file
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
139 </para>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
140 <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>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
141 <para>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
142 Modify the default <citerefentry>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
143 <refentrytitle>@PACKAGE@.conf</refentrytitle> <manvolnum>5</manvolnum>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
144 </citerefentry> configuration.
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
145 </para>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
146 </refsect1>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
147
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
148 <refsect1 id='configuration.1'>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
149 <title>Configuration</title>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
150 <para>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
151 The configuration file is documented in <citerefentry>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
152 <refentrytitle>@PACKAGE@.conf</refentrytitle> <manvolnum>5</manvolnum>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
153 </citerefentry>. Any change to the config file, or any file included
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
154 from that config file, will cause it to be reloaded within three
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
155 minutes.
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
156 </para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
157 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
158
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
159 <refsect1 id='introduction.1'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
160 <title>Introduction</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
161 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
162 Consider the case of a mail server that is acting as secondary MX for a
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
163 collection of clients, each of which has a collection of mail domains.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
164 Each client may use their own collection of DNSBLs on their primary mail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
165 server. We present here a mechanism whereby the backup mail server can
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
166 use the correct set of DNSBLs for each recipient for each message. As a
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
167 side-effect, it gives us the ability to customize the set of DNSBLs on a
183
e8a822f9cca0 embedded dcc filtering
carl
parents: 180
diff changeset
168 per-recipient basis, so that fred@example.com could use LOCAL and the
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
169 SBL, where all other users @example.com use only the SBL.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
170 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
171 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
172 This milter can also verify the envelope from/recipient pairs with the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
173 primary MX server. This allows the backup mail servers to properly
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
174 reject mail sent to invalid addresses. Otherwise, the backup mail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
175 servers will accept that mail, and then generate a bounce message when
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
176 the message is forwarded to the primary server (and rejected there with
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
177 no such user). These rejections are the primary cause of such backscatter.
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
178 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
179 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
180 This milter will also decode (uuencode, base64, mime, html entity, url
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
181 encodings) and scan for HTTP and HTTPS URLs and bare hostnames in the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
182 body of the mail. If any of those host names have A or NS records on
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
183 the SBL (or a single configurable DNSBL), the mail will be rejected
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
184 unless previously whitelisted. This milter also counts the number of
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
185 invalid HTML tags, and can reject mail if that count exceeds your
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
186 specified limit.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
187 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
188 <para>
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
189 This milter can also impose hourly rate limits on the number of
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
190 recipients accepted from SMTP AUTH connections, that would otherwise be
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
191 allowed to relay thru this mail server with no spam filtering.
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
192 </para>
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
193 <para>
162
c4bce911c276 don't add auto whitelist for A to A
carl
parents: 161
diff changeset
194 Consider the case of a message from A to B passing thru this milter. If
c4bce911c276 don't add auto whitelist for A to A
carl
parents: 161
diff changeset
195 that message is not blocked, then we might eventually see a reply
156
a220bfb9211f add auto whitelisting
carl
parents: 153
diff changeset
196 message from B to A. If the filtering context for A includes an
162
c4bce911c276 don't add auto whitelist for A to A
carl
parents: 161
diff changeset
197 autowhite entry, and that context does <emphasis>not</emphasis> cover B
c4bce911c276 don't add auto whitelist for A to A
carl
parents: 161
diff changeset
198 as a recipient, then this milter will add an entry in that file to
c4bce911c276 don't add auto whitelist for A to A
carl
parents: 161
diff changeset
199 whitelist such replies for a configurable time period. Suppose A and B
c4bce911c276 don't add auto whitelist for A to A
carl
parents: 161
diff changeset
200 are in the same domain, or at least use the same filtering context. In
c4bce911c276 don't add auto whitelist for A to A
carl
parents: 161
diff changeset
201 that case we don't want to add a whitelist entry for B, since that would
c4bce911c276 don't add auto whitelist for A to A
carl
parents: 161
diff changeset
202 then allow spammers to send mail from B (forged) to B. Such autowhite
160
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
203 files need to be writeable by the dnsbl user, where all the other dnsbl
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
204 configuration files only need to be readable by the dnsbl user.
156
a220bfb9211f add auto whitelisting
carl
parents: 153
diff changeset
205 </para>
a220bfb9211f add auto whitelisting
carl
parents: 153
diff changeset
206 <para>
176
4ec928b24bab allow manual whitelisting with stamp 1 to remove a whitelist entry
carl
parents: 175
diff changeset
207 You can manually add such an autowhite entry, by appending a single
4ec928b24bab allow manual whitelisting with stamp 1 to remove a whitelist entry
carl
parents: 175
diff changeset
208 text line to the autowhitelist file, using something like
4ec928b24bab allow manual whitelisting with stamp 1 to remove a whitelist entry
carl
parents: 175
diff changeset
209 <command>echo "$mail 0" >>$autowhitefile</command>.
4ec928b24bab allow manual whitelisting with stamp 1 to remove a whitelist entry
carl
parents: 175
diff changeset
210 You can manually remove such an autowhite entry, by appending a single
4ec928b24bab allow manual whitelisting with stamp 1 to remove a whitelist entry
carl
parents: 175
diff changeset
211 text line to the autowhitelist file, using something like
4ec928b24bab allow manual whitelisting with stamp 1 to remove a whitelist entry
carl
parents: 175
diff changeset
212 <command>echo "$mail 1" >>$autowhitefile</command>.
4ec928b24bab allow manual whitelisting with stamp 1 to remove a whitelist entry
carl
parents: 175
diff changeset
213 </para>
4ec928b24bab allow manual whitelisting with stamp 1 to remove a whitelist entry
carl
parents: 175
diff changeset
214 <para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
215 The DNSBL milter reads a text configuration file (dnsbl.conf) on
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
216 startup, and whenever the config file (or any of the referenced include
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
217 files) is changed. The entire configuration file is case insensitive.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
218 If the configuration cannot be loaded due to a syntax error, the milter
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
219 will log the error and quit. If the configuration cannot be reloaded
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
220 after being modified, the milter will log the error and send an email to
152
c7fc218686f5 gpl3, block mail to recipients that cannot reply
carl
parents: 149
diff changeset
221 root from dnsbl@$hostname. You probably want to add dnsbl@$hostname
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
222 to your /etc/mail/virtusertable since otherwise sendmail will reject
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
223 that message.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
224 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
225 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
226
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
227 <refsect1 id='dcc.1'>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
228 <title>DCC Issues</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
229 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
230 If you are also using the <ulink
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
231 url="http://www.rhyolite.com/anti-spam/dcc/">DCC</ulink> milter, there
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
232 are a few considerations. You may need to whitelist senders from the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
233 DCC bulk detector, or from the DNS based lists. Those are two very
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
234 different reasons for whitelisting. The former is done thru the DCC
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
235 whiteclnt config file, the later is done thru the DNSBL milter config
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
236 file.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
237 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
238 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
239 You may want to blacklist some specific senders or sending domains.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
240 This could be done thru either the DCC (on a global basis, or for a
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
241 specific single recipient). We prefer to do such blacklisting via the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
242 DNSBL milter config, since it can be done for a collection of recipient
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
243 mail domains. The DCC approach has the feature that you can capture the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
244 entire message in the DCC log files. The DNSBL milter approach has the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
245 feature that the mail is rejected earlier (at RCPT TO time), and the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
246 sending machine just gets a generic "550 5.7.1 no such user" message.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
247 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
248 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
249 The DCC whiteclnt file can be included in the DNSBL milter config by the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
250 dcc_to and dcc_from statements. This will import the (env_to, env_from,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
251 and substitute mail_host) entries from the DCC config into the DNSBL
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
252 config. This allows using the DCC config as the single point for
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
253 white/blacklisting.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
254 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
255 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
256 Consider the case where you have multiple clients, each with their own
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
257 mail servers, and each running their own DCC milters. Each client is
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
258 using the DCC facilities for envelope from/to white/blacklisting.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
259 Presumably you can use rsync or scp to fetch copies of your clients DCC
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
260 whiteclnt files on a regular basis. Your mail server, acting as a
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
261 backup MX for your clients, can use the DNSBL milter, and include those
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
262 client DCC config files. The envelope from/to white/blacklisting will
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
263 be appropriately tagged and used only for the domains controlled by each
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
264 of those clients.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
265 </para>
179
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
266 <para>
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
267 You can now use (via dccifd) different dcc filtering parameters on a per
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
268 context basis. See the dcc_greylist and dcc_bulk_threshold statements
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
269 in the <citerefentry> <refentrytitle>@PACKAGE@.conf</refentrytitle>
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
270 <manvolnum>5</manvolnum> </citerefentry> configuration. Those
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
271 statements are only active if you supply the <option>-b</option> option
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
272 on the dnsbl command line. If you use the dcc via the standard dcc
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
273 milter (dccm), then connections from clients that use SMTP AUTH are
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
274 still subject to greylisting. If you use the dcc via dccifd and this
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
275 milter, then connections from clients that use SMTP AUTH are never
180
7a722f482bfb embedded dcc filtering
carl
parents: 179
diff changeset
276 subject to greylisting. As part of this per-user greylisting, you need
7a722f482bfb embedded dcc filtering
carl
parents: 179
diff changeset
277 to move the dnsblnogrey file from the config directory to something
7a722f482bfb embedded dcc filtering
carl
parents: 179
diff changeset
278 like /var/dcc/userdirs/local/dnsblnogrey/whiteclnt so the dccifd will
7a722f482bfb embedded dcc filtering
carl
parents: 179
diff changeset
279 properly ignore greylisting for those recipients that don't want it.
179
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
280 </para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
281 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
282
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
283 <refsect1 id='definitions.1'>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
284 <title>Definitions</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
285 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
286 CONTEXT - a collection of parameters that defines the filtering context
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
287 to be used for a collection of envelope recipient addresses. The
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
288 context includes such things as the list of DNSBLs to be used, and the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
289 various content filtering parameters.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
290 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
291 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
292 DNSBL - a named DNS based blocking list is defined by a dns suffix (e.g.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
293 sbl-xbl.spamhaus.org) and a message string that is used to generate the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
294 "550 5.7.1" smtp error return code. The names of these DNSBLs will be
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
295 used to define the DNSBL-LISTs.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
296 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
297 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
298 DNSBL-LIST - a named list of DNSBLs that will be used for specific
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
299 recipients or recipient domains.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
300 </para>
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
301 <para>
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
302 DNSWL - a named DNS based white list is defined by a dns suffix (e.g.
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
303 list.dnswl.org) and an integer level. If the level is greater than or
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
304 equal to x in the 127.0.z.x return code from the white list, then the
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
305 ip address is considered to match, and the message will be whitelisted.
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
306 The names of these DNSWLs will be used to define the DNSWL-LISTs.
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
307 </para>
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
308 <para>
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
309 DNSWL-LIST - a named list of DNSWLs that will be used for specific
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
310 recipients or recipient domains.
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
311 </para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
312 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
313
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
314 <refsect1 id='filtering.1'>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
315 <title>Filtering Procedure</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
316 <para>
152
c7fc218686f5 gpl3, block mail to recipients that cannot reply
carl
parents: 149
diff changeset
317 The SMTP envelope 'from' and 'to' values are used in various checks.
c7fc218686f5 gpl3, block mail to recipients that cannot reply
carl
parents: 149
diff changeset
318 The first check is to see if a reply message (swapping the env_from and
160
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
319 env_to values) would be unconditionally blocked (just based on the
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
320 envelope from address). That check is similar to the main check
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
321 described below, but there is no body content to be scanned, and there
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
322 is no client connection ip address to be checked against DNSBLs. If
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
323 such a reply message would be blocked, we also block the original
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
324 outgoing message. This prevents folks from sending mail to recipients
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
325 that are unable to reply.
152
c7fc218686f5 gpl3, block mail to recipients that cannot reply
carl
parents: 149
diff changeset
326 </para>
c7fc218686f5 gpl3, block mail to recipients that cannot reply
carl
parents: 149
diff changeset
327 <para>
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
328 If the client has authenticated with sendmail, the rate limits are
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
329 checked. If the authenticated user has not exceeded the hourly rate
144
31ff00ea6bfb allow parent/child to share a fully qualified env_to address
carl
parents: 140
diff changeset
330 limit, then the mail is accepted, the filtering contexts are not used,
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
331 the dns lists are not checked, and the body content is not scanned. If
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
332 the client has not authenticated with sendmail, we follow these steps
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
333 for each recipient.
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
334 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
335 <orderedlist>
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
336 <listitem><para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
337 The envelope to email address is used to find an initial filtering
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
338 context. We first look for a context that specified the full email
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
339 address in the env_to statement. If that is not found, we look for a
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
340 context that specified the entire domain name of the envelope recipient
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
341 in the env_to statement. If that is not found, we look for a context
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
342 that specified the user@ part of the envelope recipient in the env_to
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
343 statement. If that is not found, we use the first top level context
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
344 defined in the config file.
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
345 </para></listitem>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
346 <listitem><para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
347 The initial filtering context may redirect to a child context based on
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
348 the values in the initial context's env_from statement. We look for [1)
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
349 the full envelope from email address, 2) the domain name part of the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
350 envelope from address, 3) the user@ part of the envelope from address]
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
351 in that context's env_from statement, with values that point to a child
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
352 context. If such an entry is found, we switch to that child filtering
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
353 context.
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
354 </para></listitem>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
355 <listitem><para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
356 We lookup [1) the full envelope from email address, 2) the domain name
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
357 part of the envelope from address, 3) the user@ part of the envelope
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
358 from address] in the filtering context env_from statement. That results
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
359 in one of (white, black, unknown, inherit).
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
360 </para></listitem>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
361 <listitem><para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
362 If the answer is black, mail to this recipient is rejected with "no such
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
363 user", and the dns lists are not checked.
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
364 </para></listitem>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
365 <listitem><para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
366 If the answer is white, mail to this recipient is accepted and the dns
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
367 lists are not checked.
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
368 </para></listitem>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
369 <listitem><para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
370 If the answer is unknown, we don't reject yet, but the dns lists will be
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
371 checked, and the content may be scanned.
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
372 </para></listitem>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
373 <listitem><para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
374 If the answer is inherit, we repeat the envelope from search in the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
375 parent context.
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
376 </para></listitem>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
377 <listitem><para>
233
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
378 If the mail has not been accepted or rejected yet, and the filtering
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
379 context (or any ancestor context) specifies a non-empty whitelist regular
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
380 expression, then we check the envelope from value against that regex.
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
381 The mail is accepted if the envelope from value matches the specified regular
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
382 expression.
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
383 </para></listitem>
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
384 <listitem><para>
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
385 If the mail has not been accepted or rejected yet, the dns white lists
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
386 specified in the filtering context are checked and the mail is accepted
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
387 if any list has an A record for the standard dns based lookup scheme
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
388 (reversed octets of the client followed by the dns suffix) with a final
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
389 octet greater than or equal to the level specified for that dnswl.
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
390 </para></listitem>
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
391 <listitem><para>
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
392 If the mail has not been accepted or rejected yet, the dns black lists
168
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
393 specified in the filtering context are checked and the mail is rejected
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
394 if any list has an A record for the standard dns based lookup scheme
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
395 (reversed octets of the client followed by the dns suffix).
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
396 </para></listitem>
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
397 <listitem><para>
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
398 If the mail has not been accepted or rejected yet, and the filtering
170
bd33eaccfed8 fix pre/post scripts in rpm spec file
carl
parents: 168
diff changeset
399 context (or any ancestor context) specifies a non-empty generic regular
bd33eaccfed8 fix pre/post scripts in rpm spec file
carl
parents: 168
diff changeset
400 expression, then we check the fully qualified client name (obtained via
bd33eaccfed8 fix pre/post scripts in rpm spec file
carl
parents: 168
diff changeset
401 the sendmail macro "_"). The mail is rejected if the client name
bd33eaccfed8 fix pre/post scripts in rpm spec file
carl
parents: 168
diff changeset
402 matches the specified regular expression.
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
403 </para></listitem>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
404 <listitem><para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
405 If the mail has not been accepted or rejected yet, we look for a
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
406 verification context, which is the closest ancestor of the filtering
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
407 context that both specifies a verification host, and which covers the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
408 envelope to address. If we find such a verification context, and the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
409 verification host is not our own hostname, we open an smtp conversation
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
410 with that verification host. The current envelope from and recipient to
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
411 values are passed to that verification host. If we receive a 5xy
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
412 response those commands, we reject the current recipient with "no such
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
413 user".
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
414 </para></listitem>
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
415 <listitem><para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
416 If the mail has not been accepted or rejected yet, and the filtering
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
417 context enables content filtering, and this is the first such recipient
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
418 in this smtp transaction, we set the content filtering parameters from
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
419 this context, and enable content filtering for the body of this message.
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
420 </para></listitem>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
421 </orderedlist>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
422 <para>
160
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
423 For each recipient that was accepted, we search for an autowhite entry
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
424 starting in the reply filtering context. If an autowhite entry is found,
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
425 we add the recipient to that auto whitelist file. This will prevent reply
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
426 messages from being blocked by the dnsbl or content filtering.
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
427 </para>
b3ed72ee6564 allow manual updates to auto whitelist files
carl
parents: 158
diff changeset
428 <para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
429 If content filtering is enabled for this body, the mail text is decoded
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
430 (uuencode, base64, mime, html entity, url encodings), and scanned for HTTP
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
431 and HTTPS URLs or bare host names. Hostnames must be either ip address
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
432 literals, or must end in a string defined by the TLD list. The first
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
433 &lt;configurable&gt; host names are checked as follows.
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
434 </para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
435 <para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
436 The only known list that is suitable for the content filter DNSBL is the
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
437 SBL. If the content filter DNSBL is defined, and any of those host
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
438 names resolve to ip addresses that are on that DNSBL (or have
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
439 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
440 &lt;configurable&gt; ignore list, the mail is rejected.
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
441 </para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
442 <para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
443 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
444 on that DNSBL, and the host name is not on the &lt;configurable&gt;
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
445 ignore list, the mail is rejected. Note that the Spamhaus DBL is not (yet)
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
446 suitable here, since we currently pass ip addresses to the uribl checker,
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
447 and the DBL lists all such bare ip addresses.
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
448 </para>
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
449 <para>
167
9b129ed78d7d actually use spamassassin result, allow build without spam assassin, only call it if some recipient needs it.
carl
parents: 164
diff changeset
450 If any non-whitelisted recipient has a filtering context with a non-zero
9b129ed78d7d actually use spamassassin result, allow build without spam assassin, only call it if some recipient needs it.
carl
parents: 164
diff changeset
451 spamassassin limit, then the message is passed thru spamassassin (via
9b129ed78d7d actually use spamassassin result, allow build without spam assassin, only call it if some recipient needs it.
carl
parents: 164
diff changeset
452 spamc), and the message is rejected for those recipients with spamassassin
203
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
453 limits less than the resulting spamassassin score. For example, a
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
454 spamassassin limit of three will reject messages with spamassassin scores
246
8b0f16abee53 Add prvs decoding to envelope addresses
Carl Byington <carl@five-ten-sg.com>
parents: 233
diff changeset
455 of four or greater. If the filtering context has a spamassassin limit of
8b0f16abee53 Add prvs decoding to envelope addresses
Carl Byington <carl@five-ten-sg.com>
parents: 233
diff changeset
456 zero, then spamassassin is not called (or if called the results are not used)
8b0f16abee53 Add prvs decoding to envelope addresses
Carl Byington <carl@five-ten-sg.com>
parents: 233
diff changeset
457 for this recipient.
203
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
458 </para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
459 <para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
460 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
461 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
462 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
463 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
464 </para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
465 <para>
92a5c866bdfa Verify from/to pairs even if they might be explicitly whitelisted.
Carl Byington <carl@five-ten-sg.com>
parents: 201
diff changeset
466 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
467 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
468 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
469 than or equal to the DCC bulk score.
163
97d7da45fe2a spamassassin changes
carl
parents: 162
diff changeset
470 </para>
97d7da45fe2a spamassassin changes
carl
parents: 162
diff changeset
471 <para>
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
472 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
473 limit is exceeded, the mail is rejected.
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
474 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
475 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
476
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
477 <refsect1 id='access.1'>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
478 <title>Sendmail access vs. DNSBL</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
479 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
480 With the standard sendmail.mc dnsbl FEATURE, the dnsbl checks may be
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
481 suppressed by entries in the /etc/mail/access database. For example,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
482 suppose you control a /18 of address space, and have allocated some /24s
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
483 to some clients. You have access entries like
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
484 <literallayout class="monospaced"><![CDATA[
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
485 192.168.4 OK
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
486 192.168.17 OK]]></literallayout>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
487 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
488 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
489 to allow those clients to smarthost thru your mail server. Now if one
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
490 of those clients happens get infected with a virus that turns a machine
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
491 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
492 will still wind up allowing that infected machine to smarthost thru your
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
493 mail servers.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
494 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
495 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
496 With this DNSBL milter, the sendmail access database cannot override the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
497 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
498 smarthost mail server (unless the virus/proxy can use smtp-auth).
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
499 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
500 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
501 Using the standard sendmail features, you would add access entries to
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
502 allow hosts on your local network to relay thru your mail server. Those
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
503 OK entries in the sendmail access database will override all the dnsbl
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
504 checks. With this DNSBL milter, you will need to have the local users
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
505 authenticate with smtp-auth to get the same effect. You might find
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
506 <ulink
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
507 url="http://www.ists.dartmouth.edu/classroom/sendmail-ssl-how-to.php">
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
508 these directions</ulink> helpful for setting up smtp-auth if you are on
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
509 RH Linux.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
510 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
511 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
512
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
513 <refsect1 id='performance.1'>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
514 <title>Performance Issues</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
515 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
516 Consider a high volume high performance machine running sendmail. Each
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
517 sendmail process can do its own dns resolution. Typically, such dns
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
518 resolver libraries are not thread safe, and so must be protected by some
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
519 sort of mutex in a threaded environment. When we add a milter to
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
520 sendmail, we now have a collection of sendmail processes, and a
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
521 collection of milter threads.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
522 </para>
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 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
525 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
526 serialized inside the milter, we have an upper limit of about 25K mail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
527 messages per day. That is clearly not sufficient for many sites.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
528 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
529 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
530 Since we want to do parallel dns resolution across those milter threads,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
531 we add another collection of dns resolver processes. Each sendmail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
532 process is talking to a milter thread over a socket, and each milter
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
533 thread is talking to a dns resolver process over another socket.
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 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
536 Suppose we are processing 20 messages per second, and each message
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
537 requires 20 seconds of dns work. Then we will have 400 sendmail
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
538 processes, 400 milter threads, and 400 dns resolver processes. Of
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
539 course that steady state is very unlikely to happen.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
540 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
541 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
542
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
543
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
544 <refsect1 id='rejected.1'>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
545 <title>Rejected Ideas</title>
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 The following ideas have been considered and rejected.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
548 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
549 <para>
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
550 Add max_recipients setting to the context configuration. Recipients in
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
551 excess of that limit will be rejected, and all the non-whitelisted
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
552 recipients will be removed. Current spammers *very* rarely send more
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
553 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
554 significant amount of spam.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
555 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
556 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
557 Add poison addresses to the configuration. If any recipient is
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
558 poison, all recipients are rejected even if they would be whitelisted,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
559 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
560 addresses that would be suitable for such use. Based on my log files,
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
561 any mail to those spam trap addresses is rejected based on either dnsbl
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
562 lookups or the DCC. So this won't result in blocking any additional
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
563 spam.
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 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
566 Add an option to only allow one recipient if the return path is
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
567 empty. Based on my log files, there is no mail that violates this
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
568 check.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
569 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
570 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
571 Reject the mail if the envelope from domain name contains any MX
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
572 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
573 spam sent with such domain names.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
574 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
575 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
576
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
577 <refsect1 id='todo.1'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
578 <title>TODO</title>
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 The following ideas are under consideration.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
581 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
582 <para>
115
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
583 Look for href="hostname/path" strings that are missing the required
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
584 http:// protocol header. Such references are still clickable in common
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
585 mail software.
07e5d4721213 use larger resolver buffer
carl
parents: 114
diff changeset
586 </para>
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
587 <para>
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
588 Add the ability to use the DBL for content filtering. We need to avoid
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
589 checking bare ip addresses against that list.
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
590 </para>
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
591 <para>
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
592 Add daily recipient limits based on some fixed multiple (perhaps 3?)
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
593 of the hourly limit.
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
594 </para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
595 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
596
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
597 <refsect1 id='copyright.1'>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
598 <title>Copyright</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
599 <para>
163
97d7da45fe2a spamassassin changes
carl
parents: 162
diff changeset
600 Copyright (C) 2007 by 510 Software Group &lt;carl@five-ten-sg.com&gt;
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
601 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
602 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
603 This program is free software; you can redistribute it and/or modify it
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
604 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
605 Free Software Foundation; either version 3, or (at your option) any
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
606 later version.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
607 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
608 <para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
609 You should have received a copy of the GNU General Public License along
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
610 with this program; see the file COPYING. If not, please write to the
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
611 Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
612 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
613 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
614
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
615 <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
616 <title>Version</title>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
617 <para>
201
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
618 @VERSION@
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
619 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
620 </refsect1>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
621 </refentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
622
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
623
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
624 <refentry id="@PACKAGE@.conf.5">
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
625 <refentryinfo>
233
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
626 <date>2009-05-25</date>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
627 </refentryinfo>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
628
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
629 <refmeta>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
630 <refentrytitle>@PACKAGE@.conf</refentrytitle>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
631 <manvolnum>5</manvolnum>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
632 <refmiscinfo>@PACKAGE@ @VERSION@</refmiscinfo>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
633 </refmeta>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
634
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
635 <refnamediv id='name.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
636 <refname>@PACKAGE@.conf</refname>
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
637 <refpurpose>configuration file for @PACKAGE@ sendmail milter</refpurpose>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
638 </refnamediv>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
639
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
640 <refsynopsisdiv id='synopsis.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
641 <title>Synopsis</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
642 <cmdsynopsis>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
643 <command>@PACKAGE@.conf</command>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
644 </cmdsynopsis>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
645 </refsynopsisdiv>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
646
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
647 <refsect1 id='description.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
648 <title>Description</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
649 <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
650 specified by this partial bnf description. Comments start with //
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
651 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
652 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
653 <literallayout class="monospaced"><![CDATA[include "<file>";]]></literallayout>
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
654 </para>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
655
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
656 <literallayout class="monospaced"><![CDATA[
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
657 CONFIG = {CONTEXT ";"}+
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
658 CONTEXT = "context" NAME "{" {STATEMENT}+ "}"
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
659 STATEMENT = (DNSBL | DNSBLLIST | DNSWL | DNSWLLIST | CONTENT | ENV-TO
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
660 | VERIFY | GENERIC | W_REGEX | AUTOWHITE | CONTEXT | ENV-FROM
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
661 | RATE-LIMIT) ";"
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
662
124
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
663 DNSBL = "dnsbl" NAME DNSPREFIX ERROR-MSG1
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
664 DNSBLLIST = "dnsbl_list" {NAME}+
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
665
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
666 DNSWL = "dnswl" NAME DNSPREFIX INTEGER
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
667 DNSWLLIST = "dnswl_list" {NAME}+
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
668
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
669 CONTENT = "content" ("on" | "off") "{" {CONTENT-ST}+ "}"
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
670 CONTENT-ST = (FILTER | URIBL | IGNORE | TLD | CCTLD | HTML-TAGS |
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
671 HTML-LIMIT | HOST-LIMIT | SPAMASS | REQUIRE | DCCGREY |
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
672 DCCBULK) ";"
124
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
673 FILTER = "filter" DNSPREFIX ERROR-MSG2
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
674 URIBL = "uribl" DNSPREFIX ERROR-MSG3
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
675 IGNORE = "ignore" "{" {HOSTNAME [";"]}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
676 TLD = "tld" "{" {TLD [";"]}+ "}"
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
677 CCTLD = "cctld" "{" {TLD [";"]}+ "}"
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
678 HTML-TAGS = "html_tags" "{" {HTMLTAG [";"]}+ "}"
124
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
679 ERROR-MSG1 = string containing exactly two %s replacement tokens
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
680 both are replaced with the client ip address
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
681 ERROR-MSG2 = string containing exactly two %s replacement tokens
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
682 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
683 is replaced with the ip address
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
684 ERROR-MSG3 = string containing exactly two %s replacement tokens
ea6f9c812faa put hostname in smtp message for uribl style lookups
carl
parents: 122
diff changeset
685 both are replaced with the hostname
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
686
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
687 HTML-LIMIT = "html_limit" ("on" INTEGER ERROR-MSG | "off")
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
688
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
689 HOST-LIMIT = "host_limit" ("on" INTEGER ERROR-MSG | "off" |
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
690 "soft" INTEGER)
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
691 SPAMASS = "spamassassin" INTEGER
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
692 REQUIRE = "require_match" ("yes" | "no")
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
693 DCCGREY = "dcc_greylist" ("yes" | "no")
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
694 DCCBULK = "dcc_bulk_threshold" (INTEGER | "many" | "off")
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
695
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
696 ENV-TO = "env_to" "{" {(TO-ADDR | DCC-TO)}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
697 TO-ADDR = ADDRESS [";"]
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
698 DCC-TO = "dcc_to" ("ok" | "many") "{" DCCINCLUDEFILE "}" ";"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
699
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
700 VERIFY = "verify" HOSTNAME ";"
168
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
701 GENERIC = "generic" REGULAREXPRESSION ERROR-MSG4 ";"
233
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
702 W-REGEX = "white_regex" REGULAREXPRESSION ";"
168
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
703 ERROR-MSG4 = string containing exactly one %s replacement token
6bac960af6b4 add generic reverse dns filtering regex
carl
parents: 167
diff changeset
704 which is replaced with the client name
153
8d7c439bb6fa add auto whitelisting
carl
parents: 152
diff changeset
705 AUTOWHITE = "autowhite" DAYS FILENAME ";"
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
706
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
707 ENV_FROM = "env_from" [DEFAULT] "{" {(FROM-ADDR | DCC-FROM)}+ "}"
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
708 FROM-ADDR = ADDRESS VALUE [";"]
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
709 DCC-FROM = "dcc_from" "{" DCCINCLUDEFILE "}" ";"
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
710
140
4028de9b46dd cleanup smtp rate limit code
carl
parents: 136
diff changeset
711 RATE-LIMIT = "rate_limit" [DEFAULTLIMIT] "{" (RATE)+ "}"
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
712 RATE = USER LIMIT [";"]
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
713
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
714 DEFAULT = ("white" | "black" | "unknown" | "inherit" | "")
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
715 ADDRESS = (USER@ | DOMAIN | USER@DOMAIN)
148
9330b8d6a56b add documentation fixes, allow env_from target of inherit
carl
parents: 144
diff changeset
716 VALUE = ("white" | "black" | "unknown" | "inherit" | CHILD-CONTEXT-NAME)]]></literallayout>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
717 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
718
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
719 <refsect1 id='sample.5'>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
720 <title>Sample</title>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
721 <literallayout class="monospaced"><![CDATA[
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
722 context main-default {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
723 // 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
724 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
725 dnsbl_list sbl;
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
726
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
727 // outbound content filtering to prevent our own customers from sending spam
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
728 content on {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
729 filter sbl-xbl.spamhaus.org "Mail containing %s rejected - sbl; see http://www.spamhaus.org/query/bl?ip=%s";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
730 uribl multi.surbl.org "Mail containing %s rejected - surbl; see http://www.rulesemporium.com/cgi-bin/uribl.cgi?bl0=1&domain0=%s";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
731 #uribl black.uribl.com "Mail containing %s rejected - uribl; see http://l.uribl.com/?d=%s";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
732 ignore { include "hosts-ignore.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
733 tld { include "tld.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
734 cctld { include "cctld.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
735 html_tags { include "html-tags.conf"; };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
736 html_limit on 20 "Mail containing excessive bad html tags rejected";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
737 html_limit off;
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
738 host_limit on 20 "Mail containing excessive host names rejected";
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
739 host_limit soft 20;
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
740 spamassassin 4;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
741 require_match yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
742 dcc_greylist yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
743 dcc_bulk_threshold 50;
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
744 };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
745
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
746 // backscatter prevention - don't send bounces for mail that we accepted but could not forward
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
747 // we only send bounces to our own customers
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
748 env_from unknown {
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
749 "<>" black;
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
750 };
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
751
144
31ff00ea6bfb allow parent/child to share a fully qualified env_to address
carl
parents: 140
diff changeset
752 // hourly recipient rate limit by smtp auth client id
140
4028de9b46dd cleanup smtp rate limit code
carl
parents: 136
diff changeset
753 rate_limit 30 { // default
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
754 #fred 100; // override default limits
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
755 #joe 10; // ""
136
f4746d8a12a3 add smtp auth rate limits
carl
parents: 127
diff changeset
756 };
127
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
757 };
2b1a4701e856 sendmail no longer guarantees <> wrapper on envelopes
carl
parents: 124
diff changeset
758
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
759 context main {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
760 dnsbl localp partial.blackholes.five-ten-sg.com "Mail from %s rejected - local; see http://www.five-ten-sg.com/blackhole.php?%s";
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
761 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
762 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
763 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
764 dnswl dnswl.org list.dnswl.org 2;
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
765 dnsbl_list local sbl;
249
15bf4f68a0b2 Add dnswl support
Carl Byington <carl@five-ten-sg.com>
parents: 246
diff changeset
766 dnswl_list dnswl.org;
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 content on {
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
769 filter sbl-xbl.spamhaus.org "Mail containing %s rejected - sbl; see http://www.spamhaus.org/query/bl?ip=%s";
122
e8971c595845 fix typo in multi.surbl.org name
carl
parents: 119
diff changeset
770 uribl multi.surbl.org "Mail containing %s rejected - surbl; see http://www.rulesemporium.com/cgi-bin/uribl.cgi?bl0=1&domain0=%s";
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
771 #uribl black.uribl.com "Mail containing %s rejected - uribl; see http://l.uribl.com/?d=%s";
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
772 ignore { include "hosts-ignore.conf"; };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
773 tld { include "tld.conf"; };
119
d9d2f8699621 uribl patch from Jeff Evans <jeffe@tricab.com>
carl
parents: 115
diff changeset
774 cctld { include "cctld.conf"; };
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
775 html_tags { include "html-tags.conf"; };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
776 html_limit off;
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
777 host_limit soft 20;
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
778 spamassassin 5;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
779 require_match yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
780 dcc_greylist yes;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
781 dcc_bulk_threshold 20;
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
782 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
783
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
784 generic "^dsl.static.*ttnet.net.tr$|(^|[x.-])(ppp|h|host)?([0-9]{1,3}[x.-](Red-|dynamic[x.-])?){4}"
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
785 "your mail server %s seems to have a generic name";
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
786
233
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
787 white_regex ".*=example.com=user@yourhostingaccount.com";
5c3e9bf45bb5 Add whitelisting by regex expression filtering.
Carl Byington <carl@five-ten-sg.com>
parents: 216
diff changeset
788
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
789 env_to {
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
790 # !! replace this with your domain names
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
791 # child contexts are not allowed to specify recipient addresses outside these domains
179
8b86a894514d embedded dcc filtering
carl
parents: 178
diff changeset
792 # 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
793 include "/etc/mail/local-host-names";
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
794 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
795
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
796 context whitelist {
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
797 content off {};
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
798 env_to {
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
799 # dcc_to ok { include "/var/dcc/whitecommon"; };
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
800 };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
801 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
802 # so all mail TO these env_to addresses is accepted
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
803 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
804
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
805 context abuse {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
806 dnsbl_list xbl;
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
807 content off {};
174
da0c41b9f672 don't whitelist addresses with embedded spaces
carl
parents: 172
diff changeset
808 generic "^$ " " "; # regex cannot match, to disable generic rdns rejects
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
809 env_to {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
810 abuse@ # no content filtering on abuse reports
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
811 postmaster@ # ""
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
812 };
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
813 env_from unknown {}; # ignore all parent white/black listing
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
814 };
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
815
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
816 context minimal {
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
817 dnsbl_list sbl;
178
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
818 content on {
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
819 spamassassin 10;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
820 dcc_bulk_threshold many;
d6531c702be3 embedded dcc filtering
carl
parents: 176
diff changeset
821 };
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
822 generic "^$ " " "; # regex cannot match, to disable generic rdns rejects
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
823 env_to {
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
824 };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
825 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
826
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
827 context blacklist {
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
828 env_to {
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
829 # dcc_to many { include "/var/dcc/whitecommon"; };
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
830 };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
831 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
832 # so all mail TO these env_to addresses is rejected
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
833 };
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
834
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
835 env_from unknown {
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
836 abuse@ abuse; # replies to abuse reports use the abuse context
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
837 # dcc_from { include "/var/dcc/whitecommon"; };
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
838 };
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
839
171
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
840 autowhite 90 "autowhite/my-auto-whitelist";
8deb51871b3d fix pre/post scripts in rpm spec file
carl
parents: 170
diff changeset
841 # install should create /etc/dnsbl/autowhite writable by userid dnsbl
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
842 };]]></literallayout>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
843 </refsect1>
94
e107ade3b1c0 fix dos line terminators
carl
parents: 92
diff changeset
844
111
d0dad5610980 move to autoconf/automake/docbook
carl
parents: 108
diff changeset
845 <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
846 <title>Version</title>
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
847 <para>
201
752d4315675c add reference to mercurial repository in the documentation
Carl Byington <carl@five-ten-sg.com>
parents: 187
diff changeset
848 @VERSION@
108
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
849 </para>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
850 </refsect1>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
851
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
852 </refentry>
1c7677042b78 move to autoconf/automake/docbook
carl
parents: 104
diff changeset
853 </reference>