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+<title>3.7.4 Spam Filters</title>
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+<b class="navlabel">Previous:</b> <a class="sectref" HREF="node24.html">3.7.3 Recipient Filters</A>
+<b class="navlabel">Up:</b> <a class="sectref" HREF="node21.html">3.7 The Privacy Options</A>
+<b class="navlabel">Next:</b> <a class="sectref" HREF="node26.html">3.8 The Bounce Processing</A>
+<br><hr>
+</DIV>
+<!--End of Navigation Panel-->
+
+<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>
+<dl><dd><pre class="verbatim">
+ X-Spam-Score: [*]{3,5}
+</pre></dl>
+
+<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><img src="../icons/blank.gif"
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+</tr></table>
+<b class="navlabel">Previous:</b> <a class="sectref" HREF="node24.html">3.7.3 Recipient Filters</A>
+<b class="navlabel">Up:</b> <a class="sectref" HREF="node21.html">3.7 The Privacy Options</A>
+<b class="navlabel">Next:</b> <a class="sectref" HREF="node26.html">3.8 The Bounce Processing</A>
+<hr>
+<span class="release-info">Release 2.1, documentation updated on October 2, 2004.</span>
+</DIV>
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