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+<H2><A NAME="SECTION002240000000000000000">
+2.4 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 <i>queues</i> 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
+<i>incoming</i> queue, which is also colloquially called the
+<i>moderate-and-munge</i> 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 <i>queue
+runner</i> (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="#foot41"><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="foot41">... representation</A><A
+ HREF="node8.html#tex2html1"><SUP>1</SUP></A></DT>
+<DD>Specifically, a Python pickle
+
+</DD>
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+<b class="navlabel">Next:</b> <a class="sectref" HREF="node9.html">3 The List Configuration</A>
+<hr>
+<span class="release-info">Release 2.1, documentation updated on October 2, 2004.</span>
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