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<h2><a name="SECTION001610000000000000000">
6.1 Using the Postfix mail server</a>
</h2>
<p>
Mailman should work pretty much out of the box with a standard Postfix
installation. It has been tested with various Postfix versions up to and
including Postfix 2.11.3 (as of April 2016).
<p>
In order to support Mailman's optional VERP delivery, you will want to disable
<code>luser_relay</code> (the default) and you will want to set
<code>recipient_delimiter</code> for extended address semantics. You should comment
out any <code>luser_relay</code> value in your <span class="file">main.cf</span> and just go with the
defaults. Also, add this to your <span class="file">main.cf</span> file:
<p>
<div class="verbatim"><pre>
recipient_delimiter = +
</pre></div>
<p>
Using "<tt class="samp">+</tt>" as the delimiter works well with the default values for
<var>VERP_FORMAT</var> and <var>VERP_REGEXP</var> in <span class="file">Defaults.py</span>.
<p>
When attempting to deliver a message to a non-existent local address, Postfix
may return a 450 error code. Since this is a transient error code, Mailman
will continue to attempt to deliver the message for
<var>DELIVERY_RETRY_PERIOD</var> - 5 days by default. You might want to set
Postfix up so that it returns permanent error codes for non-existent local
users by adding the following to your <span class="file">main.cf</span> file:
<p>
<div class="verbatim"><pre>
unknown_local_recipient_reject_code = 550
</pre></div>
<p>
Finally, if you are using Postfix-style virtual domains, read the section on
virtual domain support below.
<p>
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<li><a href="postfix-integration.html">6.1.1 Integrating Postfix and Mailman</a>
<li><a href="postfix-virtual.html">6.1.2 Virtual domains</a>
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<span class="release-info">Release 2.1, documentation updated on June 2, 2017.</span>
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