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