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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.
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<span class="release-info">Release 2.1, documentation updated on June 2, 2017.</span>
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