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<h3><a name="SECTION001628000000000000000">
6.2.8 Problems</a>
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<ul>
<li>Mailman will send as many <code>MAIL FROM</code>/<code>RCPT TO</code> as it needs.
It may result in more than 10 or 100 messages sent in one connection,
which will exceed the default value of Exim's
<var>smtp_accept_queue_per_connection</var> value. This is bad because it
will cause Exim to switch into queue mode and severely delay delivery of
your list messages. The way to fix this is to set Mailman's
<var>SMTP_MAX_SESSIONS_PER_CONNECTION</var> (in
<span class="file"><var>$prefix</var>/Mailman/mm_cfg.py</span>) to a smaller value than Exim's
<var>smtp_accept_queue_per_connection</var>.
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</li>
<li>Mailman should ignore Exim delay warning messages, even though Exim
should never send this to list messages. Mailman 2.1's general bounce
detection and VERP support should greatly improve the bounce detector's
hit rates.
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<li>List existence is determined by the existence of a <span class="file">config.pck</span>
file for a list. If you delete lists by foul means, be aware of this.
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<li>If you are getting Exim or Mailman complaining about user ids when you
send mail to a list, check that the <var>MAILMAN_USER</var> and
<var>MAILMAN_GROUP</var> match those of Mailman itself (i.e. what were used
in the <b class="program">configure</b> script). Also make sure you do not have
aliases in the main alias file for the list.
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<span class="release-info">Release 2.1, documentation updated on April 14, 2016.</span>
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