80 lines
3.8 KiB
HTML
80 lines
3.8 KiB
HTML
<!DOCTYPE html>
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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>Process more emails concurrently</title>
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<link rel="stylesheet" type="text/css" href="./css/markdown.css" />
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</head>
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<body>
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<div id="navigation">
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<a href="https://www.iredmail.org" target="_blank">
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<img alt="iRedMail web site"
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src="./images/logo-iredmail.png"
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style="vertical-align: middle; height: 30px;"
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/>
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<span>iRedMail</span>
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</a>
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// <a href="./index.html">Document Index</a></div><h1 id="process-more-emails-concurrently">Process more emails concurrently</h1>
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<p><strong>WARNING</strong>: Processing more concurrent emails require more RAM.</p>
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<p>Amavisd-new is content filter, it invokes 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#d0e1231">Tuning: Maximum Number of Concurrent Processes</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><div class="footer">
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<p style="text-align: center; color: grey;">All documents are available in <a href="https://bitbucket.org/zhb/iredmail-docs/src">BitBucket repository</a>, and published under <a href="http://creativecommons.org/licenses/by-nd/3.0/us/" target="_blank">Creative Commons</a> license. You can <a href="https://bitbucket.org/zhb/iredmail-docs/get/tip.tar.bz2">download the latest version</a> for offline reading. If you found something wrong, please do <a href="https://www.iredmail.org/contact.html">contact us</a> to fix it.</p>
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