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<html>
<head>
<title>Postfix - the Big Picture</title>
</head>
<body>
<h1><a href="big-picture.html"><img src="small-picture.gif" width="115" height="45"></a> Postfix
- the Big Picture</h1>
<hr>
<img src="big-picture.gif" width="810" height="269">
<p>
The figure shows the main Postfix system components, and the main
information flows between them. Postfix system components are
introduced in the <a href="receiving.html">Postfix anatomy</a>
documentation.
<p>
<ul>
<li>Yellow ellipsoids are mail programs.
<li>Yellow boxes are mail queues or files.
<li>Blue boxes are lookup tables.
<li>Programs in the large box run under control by the Postfix
resident <a href="master.8.html">master</a> daemon.
<li>Data in the large box is property of the Postfix mail system.
</ul>
In order to keep the big picture readable the following elements were omitted:
<p>
<ul>
<li>The Postfix <a href="commands.html">command-line utilities</a>.
<li>The Postfix resident <a href="master.8.html">master</a> daemon.
<li>The DNS lookups by the SMTP <a href="smtpd.8.html">server</a>
and <a href="smtp.8.html">client</a> daemons
<li>The <a href="bounce.8.html">bounce or defer</a> daemon and the
flow of bounced mail.
<li>The address rewriting and resolving requests by the SMTP server
and by the local delivery agent.
<li>The flow of mail forwarded by the local delivery agent.
<li>The flow of <a href="basic.html#notify">postmaster notices</a>
for protocol errors, policy violations, etc.
<li>Triggers to alert the <a href="pickup.8.html">pickup</a> daemon
and <a href="qmgr.8.html">queue manager</a> that new mail has arrived
in the <b>maildrop</b> and <B>incoming</b> queues, respectively.
</ul>
<hr>
</body>
</html>
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