New: performance.tunning/concurrent.processing.md.
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upgrade \
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migrations \
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howto \
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performance.tunning \
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integrations \
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cluster \
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troubleshooting \
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>Amavisd: process more emails concurrently</title>
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<link href="./css/markdown.css" rel="stylesheet"></head>
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</head>
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<body>
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<div id="navigation">
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<a href="http://www.iredmail.org" target="_blank">iRedMail web site</a>
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// <a href="./index.html">Document Index</a>
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</div><h1 id="amavisd-process-more-emails-concurrently">Amavisd: process more emails concurrently</h1>
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<p>Amavisd-new is content filter, it will invoke SpamAssassin and ClamAV for
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spam/virus scanning, it also offers additional features like DKIM signing and
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verification.</p>
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<p>In <a href="./file.location.html#amavisd">Amavisd config file</a>, <code>$max_servers</code> sets
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the number of concurrent Amavisd processes and it must match the number set
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in <code>/etc/postfix/master.cf</code> <code>maxproc</code> column for the <code>smtp-amavis</code> service.
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Sample settings:</p>
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<pre><code># File: /etc/amavisd/amavisd.conf
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$max_servers = 4;
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</code></pre>
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<pre><code># File: /etc/postfix/master.cf
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smtp-amavis unix - - - - 4 smtp
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...
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</code></pre>
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<p>Both values should be identical for two reasons: If Amavisd offers more
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processes than Postfix will ever use, Amavisd wastes resources. On the other
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hand, if Postfix starts more dedicated transports than amavisd can handle
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simultaneously, e-mail transport will be refused and logged as error.</p>
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<p>If many emails stalled in mail queue (check with command <code>postqueue -p</code>), and
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your server has powerful CPU and memory, you can increase the number of
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concurrent Amavisd processes, so that it can process more emails at the same
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time. Sample setting:</p>
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<pre><code># File: /etc/amavisd/amavisd.conf
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$max_servers = 10;
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</code></pre>
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<p>Restarting Amavisd service is required.</p>
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<pre><code># File: /etc/postfix/master.cf
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smtp-amavis unix - - - - 10 smtp
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...
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</code></pre>
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<p>Note: If you don't want to modify <code>/etc/postfix/master.cf</code>, it's ok to set
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<code>smtp-amavis_destination_concurrency_limit = 10</code> in <code>/etc/postfix/main.cf</code>
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instead.</p>
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<p>Restarting Postfix service is required if you modified <code>/etc/postfix/master.cf</code>,
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reloading OR restarting is required if you modified <code>/etc/postfix/main.cf</code>.</p>
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<p>References:</p>
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<ul>
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<li><a href="http://www.amavis.org">Amavisd web site</a></li>
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<li><a href="http://www.ijs.si/software/amavisd/README.postfix.html">Integrating amavisd-new in Postfix</a></li>
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</ul><p style="text-align: center; color: grey;">Document published under a <a href="http://creativecommons.org/licenses/by-nd/3.0/us/" target="_blank">CC BY-ND 3.0</a> license. If you found something wrong, please do <a href="http://www.iredmail.org/contact.html">contact us</a> to fix it.<script>
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(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
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m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
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})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
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ga('create', 'UA-3293801-21', 'auto');
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ga('send', 'pageview');
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</script>
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</body></html>
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@ -90,6 +90,10 @@
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<ul>
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<li><a href="http://www.iredmail.org/forum/topic8169-iredmail-support-antispam-via-dovecot-and-spamassassin.html">Anti-spam with Dovecot antispam plugin and SpamAssassin</a>, contributed by Dexus.</li>
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</ul>
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<h3 id="performance-tunning">Performance tunning</h3>
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<ul>
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<li><a href="concurrent.processing.html">Amavisd: process more emails concurrently</a></li>
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</ul>
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<h3 id="third-party-integrations">Third-party integrations</h3>
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<p>Below tutorials are maintained by iRedMail project.</p>
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<ul>
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@ -0,0 +1 @@
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Performance tunning
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@ -0,0 +1,59 @@
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# Amavisd: process more emails concurrently
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Amavisd-new is content filter, it will invoke SpamAssassin and ClamAV for
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spam/virus scanning, it also offers additional features like DKIM signing and
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verification.
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In [Amavisd config file](./file.location.html#amavisd), `$max_servers` sets
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the number of concurrent Amavisd processes and it must match the number set
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in `/etc/postfix/master.cf` `maxproc` column for the `smtp-amavis` service.
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Sample settings:
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```
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# File: /etc/amavisd/amavisd.conf
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$max_servers = 4;
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```
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```
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# File: /etc/postfix/master.cf
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smtp-amavis unix - - - - 4 smtp
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...
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```
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Both values should be identical for two reasons: If Amavisd offers more
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processes than Postfix will ever use, Amavisd wastes resources. On the other
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hand, if Postfix starts more dedicated transports than amavisd can handle
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simultaneously, e-mail transport will be refused and logged as error.
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If many emails stalled in mail queue (check with command `postqueue -p`), and
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your server has powerful CPU and memory, you can increase the number of
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concurrent Amavisd processes, so that it can process more emails at the same
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time. Sample setting:
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```
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# File: /etc/amavisd/amavisd.conf
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$max_servers = 10;
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```
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Restarting Amavisd service is required.
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```
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# File: /etc/postfix/master.cf
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smtp-amavis unix - - - - 10 smtp
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...
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```
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Note: If you don't want to modify `/etc/postfix/master.cf`, it's ok to set
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`smtp-amavis_destination_concurrency_limit = 10` in `/etc/postfix/main.cf`
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instead.
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Restarting Postfix service is required if you modified `/etc/postfix/master.cf`,
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reloading OR restarting is required if you modified `/etc/postfix/main.cf`.
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References:
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* [Amavisd web site](http://www.amavis.org)
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* [Integrating amavisd-new in Postfix](http://www.ijs.si/software/amavisd/README.postfix.html)
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