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<h3><a name="SECTION002274000000000000000">
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2.7.4 Spam Filters</a>
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This section provides some adjuncts to spam fighting tools; it
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doesn't replace dedicated anti-spam tools such as SpamAssassin or
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<dt><strong>bounce_matching_headers</strong></dt>
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<dd>This variable contains header regular expressions, one per line,
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and if any of a message's headers matches one of these patterns,
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it will be held for moderation. The format is a colon separated
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header and value, where the header is case insensitive and the
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value is any valid Python regular expression. Lines that start
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This variable can be used to catch known spammers by writing
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regexps that match against <span class="mailheader">To:</span> or <span class="mailheader">Cc:</span>
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lines, or known-bad <span class="mailheader">Message-ID:</span>s. Perhaps more useful
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though are patterns that match headers added by spam detection
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tools higher up in the tool chain. For example, you might
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configure SpamAssassin to add an <span class="mailheader">X-Spam-Score:</span> header
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with between zero and 5 stars depending on the spam score. Then
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you can add a line to this variable like:
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<div class="verbatim"><pre>
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X-Spam-Score: [*]{3,5}
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This line will match from 3 to 5 stars in the value of this
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<span class="release-info">Release 2.1, documentation updated on January 11, 2009.</span>
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