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<h3><a name="SECTION002273000000000000000">
2.7.3 Recipient Filters</a>
</h3>
<p>
The variables in this section control various filters based on the
recipient of the message.
<p>
<dl>
<dt><strong>require_explicit_destination</strong></dt>
<dd>This controls whether the mailing list posting address must be
explicitly named in the <span class="mailheader">To:</span> or <span class="mailheader">Cc:</span>
recipient lists. The main reason why it wouldn't is if the
message was blind-carbon-copied (i.e. <span class="mailheader">Bcc:</span>'d) to the
list. Spammers like to do this, but sometimes legitimate messages
are forwarded to the list this way.
<p>
If the list is not explicitly addressed and this setting is turned
on, the message will be held for moderator approval.
<p>
</dd>
<dt><strong>acceptable_aliases</strong></dt>
<dd>This is the list of alternative addresses that are acceptable as a
list posting address when <code>require_explicit_destination</code> is
enabled. This is useful for when there aliases for the main
posting address (e.g. <code>help@example.com</code> may be an alias for
<code>help-list@example.com</code>).
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</dd>
<dt><strong>max_num_recipients</strong></dt>
<dd>This is the maximum number of explicit recipients that are allowed
on the posted message. Spammers sometimes send messages with lots
of explicit recipients, so setting this number to a reasonable
value may cut down on spam.
</dd>
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<span class="release-info">Release 2.1, documentation updated on January 11, 2020.</span>
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