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<h1>Dovecot</h1>
<h2 id="add-configuration"><a class="toclink" href="#add-configuration">Add Configuration</a></h2>
<p>The Dovecot default configuration can easily be extended providing a <code>docker-data/dms/config/dovecot.cf</code> file.
<a href="https://doc.dovecot.org/configuration_manual/">Dovecot documentation</a> remains the best place to find configuration options.</p>
<p>Your <code>docker-mailserver</code> folder should look like this example:</p>
<div class="highlight"><pre><span></span><code>├── docker-data/dms/config
│ ├── dovecot.cf
│ ├── postfix-accounts.cf
│ └── postfix-virtual.cf
├── docker-compose.yml
└── README.md
</code></pre></div>
<p>One common option to change is the maximum number of connections per user:</p>
<div class="highlight"><pre><span></span><code><span class="na">mail_max_userip_connections</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">100</span><span class="w"></span>
</code></pre></div>
<p>Another important option is the <code>default_process_limit</code> (defaults to <code>100</code>). If high-security mode is enabled you'll need to make sure this count is higher than the maximum number of users that can be logged in simultaneously.</p>
<p>This limit is quickly reached if users connect to the <code>docker-mailserver</code> with multiple end devices.</p>
<h2 id="override-configuration"><a class="toclink" href="#override-configuration">Override Configuration</a></h2>
<p>For major configuration changes it’s best to override the dovecot configuration files. For each configuration file you want to override, add a list entry under the <code>volumes</code> key.</p>
<div class="highlight"><pre><span></span><code><span class="nt">services</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="nt">mailserver</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="nt">volumes</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">./docker-data/dms/mail-data/:/var/mail/</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">./docker-data/dms/config/dovecot/10-master.conf:/etc/dovecot/conf.d/10-master.conf</span><span class="w"></span>
</code></pre></div>
<p>You will first need to obtain the configuration from the running container (<em>where <code>mailserver</code> is the container name</em>):</p>
<div class="highlight"><pre><span></span><code>mkdir -p ./docker-data/dms/config/dovecot
docker cp mailserver:/etc/dovecot/conf.d/10-master.conf ./docker-data/dms/config/dovecot/10-master.conf
</code></pre></div>
<h2 id="debugging"><a class="toclink" href="#debugging">Debugging</a></h2>
<p>To debug your dovecot configuration you can use:</p>
<ul>
<li>This command: <code>./setup.sh debug login doveconf | grep &lt;some-keyword&gt;</code></li>
<li>Or: <code>docker exec -it mailserver doveconf | grep &lt;some-keyword&gt;</code></li>
</ul>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><a href="https://github.com/docker-mailserver/docker-mailserver/blob/master/setup.sh"><code>setup.sh</code></a> is included in the <code>docker-mailserver</code> repository. Make sure to use the one matching your image version release.</p>
</div>
<p>The file <code>docker-data/dms/config/dovecot.cf</code> is copied internally to <code>/etc/dovecot/local.conf</code>. To verify the file content, run:</p>
<div class="highlight"><pre><span></span><code>docker <span class="nb">exec</span> -it mailserver cat /etc/dovecot/local.conf
</code></pre></div>
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