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+<h3><a name="SECTION002274000000000000000">
+2.7.4 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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+<a class="sectref" rel="prev" href="node23.html">2.7.3 Recipient Filters</a>
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+<hr />
+<span class="release-info">Release 2.1, documentation updated on December 5, 2007.</span>
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