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<h1>Postfix</h1>
<p>The Postfix default configuration can easily be extended by providing a <code>config/postfix-main.cf</code> in postfix format.
This can also be used to add configuration that is not in our default configuration.</p>
<p>For example, one common use of this file is for increasing the default maximum message size:</p>
<div class="highlight"><pre><span></span><code><span class="c1"># increase maximum message size</span>
<span class="na">message_size_limit</span> <span class="o">=</span> <span class="s">52428800</span>
</code></pre></div>
<p>That specific example is now supported and can be handled by setting <code>POSTFIX_MESSAGE_SIZE_LIMIT</code>.</p>
<div class="admonition seealso">
<p class="admonition-title">Seealso</p>
<p><a href="http://www.postfix.org/documentation.html">Postfix documentation</a> remains the best place to find configuration options.</p>
</div>
<p>Each line in the provided file will be loaded into postfix.</p>
<p>In the same way it is possible to add a custom <code>config/postfix-master.cf</code> file that will override the standard <code>master.cf</code>. Each line in the file will be passed to <code>postconf -P</code>. The expected format is <code>&lt;service_name&gt;/&lt;type&gt;/&lt;parameter&gt;</code>, for example:</p>
<div class="highlight"><pre><span></span><code><span class="na">submission/inet/smtpd_reject_unlisted_recipient</span><span class="o">=</span><span class="s">no</span>
</code></pre></div>
<p>Run <code>postconf -P</code> in the container without arguments to see the active master options.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>There should be no space between the parameter and the value.</p>
</div>
<p>Have a look at the code for more information.</p>
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