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<title>7 Review your site defaults</title>
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<h1><a name="SECTION001700000000000000000"></a><a name="customizing"></a>
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7 Review your site defaults
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Mailman has a large number of site-wide configuration options which you should
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now review and change according to your needs. Some of the options control
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how Mailman interacts with your environment, and other options select defaults
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for newly created lists<a name="tex2html5"
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href="#foot733"><sup>5</sup></a>.
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There are system tuning parameters and integration options.
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The full set of site-wide defaults lives in the
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<span class="file"><var>$prefix</var>/Mailman/Defaults.py</span> file, however you should
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<strong>never</strong> modify this file! Instead, change the <span class="file">mm_cfg.py</span> file in
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that same directory. You only need to add values to <span class="file">mm_cfg.py</span> that are
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different than the defaults in <span class="file">Defaults.py</span>, and future Mailman upgrades
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are guaranteed never to touch your <span class="file">mm_cfg.py</span> file.
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The <span class="file">Defaults.py</span> file is documented extensively, so the options are not
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described here. The <span class="file">Defaults.py</span> and <span class="file">mm_cfg.py</span> are both
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<a class="ulink" href="http://www.python.org"
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>Python</a> files so valid Python syntax must be
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maintained or your Mailman installation will break.
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<div class="note"><b class="label">Note:</b>
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Do <strong>not</strong> change the <var>HOME_DIR</var> or <var>MAILMAN_DIR</var> variables.
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These are set automatically by the <b class="program">configure</b> script, and you will
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break your Mailman installation by if you change these.
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You should make any changes to <span class="file">mm_cfg.py</span> using the account you
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installed Mailman under in the <a href="troubleshooting.html#building">14</a> section.
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<br><hr><h4>Footnotes</h4>
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<dt><a name="foot733">... lists</a><A
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href="customizing.html#tex2html5"><sup>5</sup></a></dt>
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<dd>In general, changing the list defaults
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described in this section will not affect any already created lists. To make
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changes after a list has been created, use the web interface or the command
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line scripts, such as <b class="program">bin/withlist</b> and <b class="program">bin/config_list</b>.
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<span class="release-info">Release 2.1, documentation updated on April 21, 2008.</span>
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