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<h1><a name="SECTION001700000000000000000"></a><a name="customizing"></a>
<br>
7 Review your site defaults
</h1>

<p>
Mailman has a large number of site-wide configuration options which you should
now review and change according to your needs.  Some of the options control
how Mailman interacts with your environment, and other options select defaults
for newly created lists<a name="tex2html5"
  href="#foot755"><sup>5</sup></a>.
There are system tuning parameters and integration options.

<p>
The full set of site-wide defaults lives in the
<span class="file"><var>$prefix</var>/Mailman/Defaults.py</span> file, however you should
<strong>never</strong> modify this file!  Instead, change the <span class="file">mm_cfg.py</span> file in
that same directory.  You only need to add values to <span class="file">mm_cfg.py</span> that are
different than the defaults in <span class="file">Defaults.py</span>, and future Mailman upgrades
are guaranteed never to touch your <span class="file">mm_cfg.py</span> file.

<p>
The <span class="file">Defaults.py</span> file is documented extensively, so the options are not
described here.  The <span class="file">Defaults.py</span> and <span class="file">mm_cfg.py</span> are both
<a class="ulink" href="http://www.python.org"
  >Python</a> files so valid Python syntax must be
maintained or your Mailman installation will break.

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

Do <strong>not</strong> change the <var>HOME_DIR</var> or <var>MAILMAN_DIR</var> variables.
These are set automatically by the <b class="program">configure</b> script, and you will
break your Mailman installation by if you change these.
</div>

<p>
You should make any changes to <span class="file">mm_cfg.py</span> using the account you
installed Mailman under in the <a href="building.html#building">3</a> section.

<p>
<br><hr><h4>Footnotes</h4>
<dl>
<dt><a name="foot755">... lists</a><A
 href="customizing.html#tex2html5"><sup>5</sup></a></dt>
<dd>In general, changing the list defaults
described in this section will not affect any already created lists.  To make
changes after a list has been created, use the web interface or the command
line scripts, such as <b class="program">bin/withlist</b> and <b class="program">bin/config_list</b>.

</dd>
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<span class="release-info">Release 2.1, documentation updated on July 19, 2013.</span>
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