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+<link rel="first" href="mailman-admin.html" title='GNU Mailman - List Administration Manual'>
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+
+<H3><A NAME="SECTION002374000000000000000">
+3.7.4 Spam Filters</A>
+</H3>
+
+<P>
+This section provides some adjuncts to spam fighting tools; it
+doesn't replace dedicated anti-spam tools such as SpamAssassin or
+Spambayes.
+
+<P>
+<DL>
+<DT><STRONG>bounce_matching_headers</STRONG></DT>
+<DD>This variable contains header regular expressions, one per line,
+ and if any of a message's headers matches one of these patterns,
+ it will be held for moderation. The format is a colon separated
+ header and value, where the header is case insensitive and the
+ value is any valid Python regular expression. Lines that start
+ with # are ignored.
+
+<P>
+This variable can be used to catch known spammers by writing
+ regexps that match against <span class="mailheader">To:</span> or <span class="mailheader">Cc:</span>
+ lines, or known-bad <span class="mailheader">Message-ID:</span>s. Perhaps more useful
+ though are patterns that match headers added by spam detection
+ tools higher up in the tool chain. For example, you might
+ configure SpamAssassin to add an <span class="mailheader">X-Spam-Score:</span> header
+ with between zero and 5 stars depending on the spam score. Then
+ you can add a line to this variable like:
+
+<P>
+<div class="verbatim"><pre>
+ X-Spam-Score: [*]{3,5}
+</pre></div>
+
+<P>
+This line will match from 3 to 5 stars in the value of this
+ field.
+</DD>
+</DL>
+
+<P>
+
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+<p><hr>
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+<td align="center" width="100%">GNU Mailman - List Administration Manual</td>
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+ href="contents.html"><img src='contents.gif'
+ border='0' height='32' alt='Contents' width='32'></A></td>
+<td><img src='blank.gif'
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+<hr>
+<span class="release-info">Release 2.1, documentation updated on September 12, 2004.</span>
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