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+<link rel="first" href="mailman-admin.html" title='GNU mailman - list Administration Manual' />
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+<title>1.4 Basic Architectural Overview</title>
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+<h2><a name="SECTION002140000000000000000">
+1.4 Basic Architectural Overview</a>
+</h2>
+
+<p>
+This section will outline the basic architecture of GNU Mailman, such
+as how messages are processed by the sytem. Without going into lots
+of detail, this information will help you understand how the
+configuration options control Mailman's functionality.
+
+<p>
+When mail enters the system from your mail server, it is dropped into
+one of several Mailman <em>queues</em> depending on the address the
+message was sent to. For example, if your system has a mailing list
+named <var>mylist</var> and your domain is <var>example.com</var>, people can
+post messages to your list by sending them to
+<var>mylist@example.com</var>. These messages will be dropped into the
+<em>incoming</em> queue, which is also colloquially called the
+<em>moderate-and-munge</em> queue. The incoming queue is where most of
+the approval process occurs, and it's also where the message is
+prepared for sending out to the list membership.
+
+<p>
+There are separate queues for the built-in archiver, the bounce
+processor, the email command processor, as well as the outgoing email
+and news queues. There's also a queue for messages generated by the
+Mailman system. Each of these queues typically has one <em>queue
+runner</em> (or ``qrunner'') that processes messages in the queue. The
+qrunners are idle when there are no messages to process.
+
+<p>
+Every message in the queues are represented by two files, a message
+file and a metadata file. Both of these files share the same base
+name, which is a combination of a unique hash and the Unix time that
+the message was received. The metadata file has a suffix of
+<span class="file">.db</span> and the message file has a suffix of either <span class="file">.msg</span> if
+stored in plain text, or <span class="file">.pck</span> if stored in a more efficient
+internal representation<a name="tex2html1"
+ href="#foot39"><sup>1</sup></a>.
+
+<p>
+As a message moves through the incoming queue, it performs various
+checks on the message, such as whether it matches one of the
+moderation criteria, or contains disallowed MIME types. Once a
+message is approved for sending to the list membership, the message is
+prepared for sending by deleting, adding, or changing message headers,
+adding footers, etc. Messages in the incoming queue may also be
+stored for appending to digests.
+
+<p>
+<br><hr><h4>Footnotes</h4>
+<dl>
+<dt><a name="foot39">... representation</a><A
+ HREF="node7.html#tex2html1"><sup>1</sup></a></dt>
+<dd>Specifically, a Python pickle
+
+</dd>
+</dl>
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+<td align="center" width="100%">GNU Mailman - List Administration Manual</td>
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+</div>
+<hr />
+<span class="release-info">Release 2.1, documentation updated on December 5, 2007.</span>
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