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<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<meta name="description" content="A fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) using Docker.">
<meta name="description" content="A fullstack but simple mail-server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) using Docker.">
@ -16,15 +16,15 @@
<link rel="canonical" href="https://docker-mailserver.github.io/docker-mailserver/edge/examples/tutorials/mailserver-behind-proxy/">
<link rel="icon" href="../../../assets/logo/favicon-32x32.png">
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<title>Tutorials | Mailserver behind Proxy - Docker Mailserver</title>
<title>Tutorials | Mail-Server behind a Proxy - Docker Mailserver</title>
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<div class="md-header__topic" data-md-component="header-topic">
<span class="md-ellipsis">
Tutorials | Mailserver behind Proxy
Tutorials | Mail-Server behind a Proxy
</span>
</div>
@ -1039,12 +1039,12 @@
<label class="md-nav__link md-nav__link--active" for="__toc">
Mailserver behind Proxy
Mail-Server behind a Proxy
<span class="md-nav__icon md-icon"></span>
</label>
<a href="./" class="md-nav__link md-nav__link--active">
Mailserver behind Proxy
Mail-Server behind a Proxy
</a>
@ -1146,7 +1146,7 @@
<li class="md-nav__item">
<a href="../../uses-cases/forward-only-mailserver-with-ldap-authentication/" class="md-nav__link">
Forward-Only Mailserver with LDAP
Forward-Only Mail-Server with LDAP
</a>
</li>
@ -1373,7 +1373,7 @@
</a>
<h1>Mailserver behind Proxy</h1>
<h1>Mail-Server behind a Proxy</h1>
<h2 id="using-docker-mailserver-behind-a-proxy"><a class="toclink" href="#using-docker-mailserver-behind-a-proxy">Using <code>docker-mailserver</code> behind a Proxy</a></h2>
<h3 id="information"><a class="toclink" href="#information">Information</a></h3>
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<p>Luckily <code>dovecot</code> and <code>postfix</code> are both Proxy-Protocol ready softwares so it depends only on your used reverse-proxy / loadbalancer.</p>
<h3 id="configuration-of-the-used-proxy-software"><a class="toclink" href="#configuration-of-the-used-proxy-software">Configuration of the used Proxy Software</a></h3>
<p>The configuration depends on the used proxy system. I will provide the configuration examples of <a href="https://traefik.io/">traefik v2</a> using IMAP and SMTP with implicit TLS.</p>
<p>Feel free to add your configuration if you archived the same goal using different proxy software below:</p>
<p>Feel free to add your configuration if you achieved the same goal using different proxy software below:</p>
<details><summary>Traefik v2</summary><p>Truncated configuration of traefik itself:</p>
<div class="highlight"><pre><span></span><code><span class="nt">version</span><span class="p">:</span> <span class="s">&#39;3.7&#39;</span>
<div class="highlight"><pre><span></span><code><span class="nt">version</span><span class="p">:</span> <span class="s">&#39;3.8&#39;</span>
<span class="nt">services</span><span class="p">:</span>
<span class="nt">reverse-proxy</span><span class="p">:</span>
<span class="nt">image</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">traefik:latest</span>
<span class="nt">image</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">docker.io/traefik:latest</span> <span class="c1"># v2.5</span>
<span class="nt">container_name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">docker-traefik</span>
<span class="nt">restart</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">always</span>
<span class="nt">command</span><span class="p">:</span>
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<span class="p p-Indicator">-</span> <span class="s">&quot;4190:4190&quot;</span>
<span class="p p-Indicator">[</span><span class="nv">...</span><span class="p p-Indicator">]</span>
</code></pre></div>
<p>Truncated list of necessary labels on the mailserver container:</p>
<p>Truncated list of necessary labels on the <code>docker-mailserver</code> container:</p>
<div class="highlight"><pre><span></span><code><span class="nt">version</span><span class="p">:</span> <span class="s">&#39;3.8&#39;</span>
<span class="nt">services</span><span class="p">:</span>
<span class="nt">mailserver</span><span class="p">:</span>
<span class="nt">image</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">docker.io/mailserver/docker-mailserver:latest</span>
<span class="nt">container_name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">mailserver</span>
<span class="nt">hostname</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">mail</span>
<span class="nt">domainname</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">example.com</span>
<span class="nt">container_name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">mailserver</span>
<span class="nt">restart</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">always</span>
<span class="nt">networks</span><span class="p">:</span>
<span class="p p-Indicator">-</span> <span class="l l-Scalar l-Scalar-Plain">proxy</span>
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</details>
<h3 id="configuration-of-the-backend-dovecot-and-postfix"><a class="toclink" href="#configuration-of-the-backend-dovecot-and-postfix">Configuration of the Backend (<code>dovecot</code> and <code>postfix</code>)</a></h3>
<p>The following changes can be achieved completely by adding the content to the appropriate files by using the projects <a href="../../../config/advanced/optional-config/">function to overwrite config files</a>.</p>
<p>Changes for <code>postfix</code> can be applied by adding the following content to <code>config/postfix-main.cf</code>:</p>
<p>Changes for <code>postfix</code> can be applied by adding the following content to <code>docker-data/dms/config/postfix-main.cf</code>:</p>
<div class="highlight"><pre><span></span><code><span class="na">postscreen_upstream_proxy_protocol</span> <span class="o">=</span> <span class="s">haproxy</span>
</code></pre></div>
<p>and to <code>config/postfix-master.cf</code>:</p>
<p>and to <code>docker-data/dms/config/postfix-master.cf</code>:</p>
<div class="highlight"><pre><span></span><code><span class="na">submission/inet/smtpd_upstream_proxy_protocol</span><span class="o">=</span><span class="s">haproxy</span>
<span class="na">smtps/inet/smtpd_upstream_proxy_protocol</span><span class="o">=</span><span class="s">haproxy</span>
</code></pre></div>
<p>Changes for <code>dovecot</code> can be applied by adding the following content to <code>config/dovecot.cf</code>:</p>
<p>Changes for <code>dovecot</code> can be applied by adding the following content to <code>docker-data/dms/config/dovecot.cf</code>:</p>
<div class="highlight"><pre><span></span><code><span class="na">haproxy_trusted_networks</span> <span class="o">=</span> <span class="s">&lt;your-proxy-ip&gt;, &lt;optional-cidr-notation&gt;</span>
<span class="na">haproxy_timeout</span> <span class="o">=</span> <span class="s">3 secs</span>
<span class="na">service imap-login {</span>
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<div class="md-dialog" data-md-component="dialog">
<div class="md-dialog__inner md-typeset"></div>
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