New: backupmx.md. How to mark a mail domain as backup MX.
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# How to mark a mail domain as backup MX
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[TOC]
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This tutorial describes how to mark a mail domain as a backup MX.
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## How backup MX works in brief
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When smtp service on primary MX server is down, emails will be delivered to
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backup MX server. When backup MX server detects smtp service on primary MX is
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back online, it will relay received emails to primary MX.
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## Make sure you have correct DNS records for the mail domain
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To let other mail servers know your server is the backup MX server of this
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mail domain, you must add your mail server info in its MX type DNS record.
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For example, main mail server of your mail domain `example.com` is
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`mx01.example.com`, to set your iRedMail server `mx02.example.com` as backup
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MX of `example.com`, you need to add `mx02.example.com` as your lower priority
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mail server in MX type DNS record.
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```
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example.com. 3600 IN MX 5 mx01.example.com
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example.com. 3600 IN MX 10 mx02.example.com
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```
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Server `mx01.example.com` has priority number `5`, and `mx02.example.com` has
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priority number `10`. For mail service, the lowest number has highest priority.
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so with above example, server `mx01.example.com` is the primary MX, and
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`mx02.example.com` is a backup MX.
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When mail service on `mx01.example.com` is down, other mail services will
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connect to `mx02.example.com`.
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## Mark domain as backup MX with iRedAdmin-Pro
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It's easy to manage domain profile With iRedAdmin-Pro, including backup MX setting.
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Go to domain profile page, click tab `Backup MX`:
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{: width=1000px }
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## Mark domain as backup MX with command line tools
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### For SQL backends
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!!! note "Primary server address"
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You should set the IP address of primary MX as relay server to avoid mail
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loop.
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SQL commands (we use MySQL for example):
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```
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USE vmail;
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UPDATE domain SET transport='relay:[45.56.127.226]:25',backupmx=1 WHERE domain='example.com';
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```
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In above example, we mark domain `example.com` as a backup MX, and use IP
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address `45.56.127.226` as primary MX server, you should replace it by the real
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IP address.
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### For LDAP backends
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In domain object, please add LDAP attribute/value pair like below:
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```
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domainBackupMX: yes
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mtaTransport: relay:[45.56.127.226]:25
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```
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<!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>How to mark a mail domain as backup MX</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="/index.html" 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="how-to-mark-a-mail-domain-as-backup-mx">How to mark a mail domain as backup MX</h1>
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<div class="toc">
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<ul>
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<li><a href="#how-to-mark-a-mail-domain-as-backup-mx">How to mark a mail domain as backup MX</a><ul>
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<li><a href="#how-backup-mx-works-in-brief">How backup MX works in brief</a></li>
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<li><a href="#make-sure-you-have-correct-dns-records-for-the-mail-domain">Make sure you have correct DNS records for the mail domain</a></li>
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<li><a href="#mark-domain-as-backup-mx-with-iredadmin-pro">Mark domain as backup MX with iRedAdmin-Pro</a></li>
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<li><a href="#mark-domain-as-backup-mx-with-command-line-tools">Mark domain as backup MX with command line tools</a><ul>
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<li><a href="#for-sql-backends">For SQL backends</a></li>
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<li><a href="#for-ldap-backends">For LDAP backends</a></li>
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</ul>
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</li>
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</ul>
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</li>
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</ul>
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</div>
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<p>This tutorial describes how to mark a mail domain as a backup MX.</p>
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<h2 id="how-backup-mx-works-in-brief">How backup MX works in brief</h2>
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<p>When smtp service on primary MX server is down, emails will be delivered to
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backup MX server. When backup MX server detects smtp service on primary MX is
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back online, it will relay received emails to primary MX.</p>
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<h2 id="make-sure-you-have-correct-dns-records-for-the-mail-domain">Make sure you have correct DNS records for the mail domain</h2>
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<p>To let other mail servers know your server is the backup MX server of this
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mail domain, you must add your mail server info in its MX type DNS record.</p>
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<p>For example, main mail server of your mail domain <code>example.com</code> is
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<code>mx01.example.com</code>, to set your iRedMail server <code>mx02.example.com</code> as backup
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MX of <code>example.com</code>, you need to add <code>mx02.example.com</code> as your lower priority
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mail server in MX type DNS record. </p>
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<pre><code>example.com. 3600 IN MX 5 mx01.example.com
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example.com. 3600 IN MX 10 mx02.example.com
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</code></pre>
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<p>Server <code>mx01.example.com</code> has priority number <code>5</code>, and <code>mx02.example.com</code> has
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priority number <code>10</code>. For mail service, the lowest number has highest priority.
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so with above example, server <code>mx01.example.com</code> is the primary MX, and
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<code>mx02.example.com</code> is a backup MX.</p>
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<p>When mail service on <code>mx01.example.com</code> is down, other mail services will
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connect to <code>mx02.example.com</code>.</p>
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<h2 id="mark-domain-as-backup-mx-with-iredadmin-pro">Mark domain as backup MX with iRedAdmin-Pro</h2>
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<p>It's easy to manage domain profile With iRedAdmin-Pro, including backup MX setting.
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Go to domain profile page, click tab <code>Backup MX</code>:</p>
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<p><img alt="" src="http://www.iredmail.org/images/iredadmin/domain_profile_backupmx.png" width="1000px" /></p>
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<h2 id="mark-domain-as-backup-mx-with-command-line-tools">Mark domain as backup MX with command line tools</h2>
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<h3 id="for-sql-backends">For SQL backends</h3>
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<div class="admonition note">
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<p class="admonition-title">Primary server address</p>
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<p>You should set the IP address of primary MX as relay server to avoid mail
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loop.</p>
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</div>
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<p>SQL commands (we use MySQL for example):</p>
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<pre><code>USE vmail;
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UPDATE domain SET transport='relay:[45.56.127.226]:25',backupmx=1 WHERE domain='example.com';
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</code></pre>
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<p>In above example, we mark domain <code>example.com</code> as a backup MX, and use IP
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address <code>45.56.127.226</code> as primary MX server, you should replace it by the real
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IP address.</p>
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<h3 id="for-ldap-backends">For LDAP backends</h3>
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<p>In domain object, please add LDAP attribute/value pair like below:</p>
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<pre><code>domainBackupMX: yes
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mtaTransport: relay:[45.56.127.226]:25
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</code></pre><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="http://www.iredmail.org/contact.html">contact us</a> to fix it.</p>
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@ -104,6 +104,7 @@
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<li><a href="amavisd.per-recipient.policy.lookup.html">Amavisd: Enable per-recipient policy lookup</a></li>
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<li><a href="amavisd.wblist.html">Whitelists and Blacklists</a></li>
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<li><a href="authenticate.without.domain.name.html">Authenticate without domain part in email address</a></li>
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<li><a href="backupmx.html">How to mark a mail domain as backup MX</a></li>
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<li><a href="change.server.hostname.html">Change server hostname</a></li>
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<li><a href="concurrent.processing.html">Process more emails concurrently</a></li>
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<li><a href="dovecot.master.user.html">Dovecot Master User: Access user's mailbox without owner's password.</a></li>
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