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<h3><a name="SECTION001611000000000000000"></a><a name="postfix-integration"></a>
<br>
6.1.1 Integrating Postfix and Mailman
</h3>

<p>
You can integrate Postfix and Mailman such that when new lists are created, or
lists are removed, Postfix's alias database will be automatically updated.
The following are the steps you need to take to make this work.

<p>
In the description below, we assume that you've installed Mailman in the
default location, i.e. <span class="file">/usr/local/mailman</span>.  If that's not the case,
adjust the instructions according to your use of <b class="program">configure</b>'s
<b class="programopt">--prefix</b> and <b class="programopt">--with-var-prefix</b> options.

<p>
<div class="note"><b class="label">Note:</b>

If you are using virtual domains and you want Mailman to honor your virtual
domains, read the <a href="postfix-virtual.html#postfix-virtual">6.1</a> section below first!
</div>

<p>

<ul>
<li>Add this to the bottom of the <span class="file"><var>$prefix</var>/Mailman/mm_cfg.py</span>
      file:

<p>
<div class="verbatim"><pre>
        MTA = 'Postfix'
</pre></div>

<p>
The MTA variable names a module in the <span class="file">Mailman/MTA</span> directory
      which contains the mail server-specific functions to be executed when a
      list is created or removed.

<p>
</li>
<li>Look at the <span class="file">Defaults.py</span> file for the variables
      <var>POSTFIX_ALIAS_CMD</var> and <var>POSTFIX_MAP_CMD</var> command.  Make sure
      these point to your <b class="program">postalias</b> and <b class="program">postmap</b> programs
      respectively.  Remember that if you need to make changes, do it in
      <span class="file">mm_cfg.py</span>.

<p>
</li>
<li>Run the <b class="program">bin/genaliases</b> script to initialize your
      <span class="file">aliases</span> file.

<p>
<div class="verbatim"><pre>
        % cd /usr/local/mailman
        % bin/genaliases
      </pre></div>

<p>
Make sure that the owner of the <span class="file">data/aliases</span> and
      <span class="file">data/aliases.db</span> file is <code>mailman</code>, that the group owner
      for those files is <code>mailman</code>, or whatever user and group you used
      in the configure command, and that both files are group writable:

<p>
<div class="verbatim"><pre>
        % su
        % chown mailman:mailman data/aliases*
        % chmod g+w data/aliases*
      </pre></div>

<p>
</li>
<li>Hack your Postfix's <span class="file">main.cf</span> file to include the following path in
      your <var>alias_maps</var> variable:

<p>
<div class="verbatim"><pre>
          /usr/local/mailman/data/aliases
</pre></div>

<p>
Note that there should be no trailing <code>.db</code>.  Do not include this
      in your <var>alias_database</var> variable.  This is because you do not want
      Postfix's <b class="program">newaliases</b> command to modify Mailman's
      <span class="file">aliases.db</span> file, but you do want Postfix to consult
      <span class="file">aliases.db</span> when looking for local addresses.

<p>
You probably want to use a <code>hash:</code> style database for this entry.
      Here's an example:

<p>
<div class="verbatim"><pre>
        alias_maps = hash:/etc/postfix/aliases,
            hash:/usr/local/mailman/data/aliases
</pre></div>

<p>
</li>
<li>When you configure Mailman, use the
      <b class="programopt">--with-mail-gid=mailman</b> switch; this will be the default
      if you configured Mailman after adding the <code>mailman</code> owner.
      Because the owner of the <span class="file">aliases.db</span> file is <code>mailman</code>,
      Postfix will execute Mailman's wrapper program as uid and gid
      <code>mailman</code>.

<p>
</li>
</ul>

<p>
That's it!  One caveat: when you add or remove a list, the <span class="file">aliases.db</span>
file will updated, but it will not automatically run <b class="program">postfix reload</b>.
This is because you need to be root to run this and suid-root scripts are not
secure.  The only effect of this is that it will take about a minute for
Postfix to notice the change to the <span class="file">aliases.db</span> file and update its
tables.

<p>

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<span class="release-info">Release 2.1, documentation updated on May 15, 2012.</span>
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