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docker-mailserver/v11.0/config/advanced/mail-forwarding/relay-hosts/index.html
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<h1>Relay Hosts</h1>
<h2 id="introduction"><a class="toclink" href="#introduction">Introduction</a></h2>
<p>Rather than having Postfix deliver mail directly, you can configure Postfix to send mail via another mail relay (smarthost). Examples include <a href="https://www.mailgun.com/">Mailgun</a>, <a href="https://sendgrid.com/">Sendgrid</a> and <a href="https://aws.amazon.com/ses/">AWS SES</a>.</p>
<p>Depending on the domain of the sender, you may want to send via a different relay, or authenticate in a different way.</p>
<h2 id="basic-configuration"><a class="toclink" href="#basic-configuration">Basic Configuration</a></h2>
<p>Basic configuration is done via environment variables:</p>
<ul>
<li><code>RELAY_HOST</code>: <em>default host to relay mail through, <code>empty</code> (aka '', or no ENV set) will disable this feature</em></li>
<li><code>RELAY_PORT</code>: <em>port on default relay, defaults to port 25</em></li>
<li><code>RELAY_USER</code>: <em>username for the default relay</em></li>
<li><code>RELAY_PASSWORD</code>: <em>password for the default user</em></li>
</ul>
<p>Setting these environment variables will cause mail for all sender domains to be routed via the specified host, authenticating with the user/password combination.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>For users of the previous <code>AWS_SES_*</code> variables: please update your configuration to use these new variables, no other configuration is required.</p>
</div>
<h2 id="advanced-configuration"><a class="toclink" href="#advanced-configuration">Advanced Configuration</a></h2>
<h3 id="sender-dependent-authentication"><a class="toclink" href="#sender-dependent-authentication">Sender-dependent Authentication</a></h3>
<p>Sender dependent authentication is done in <code>docker-data/dms/config/postfix-sasl-password.cf</code>. You can create this file manually, or use:</p>
<div class="highlight"><pre><span></span><code>setup.sh relay add-auth &lt;domain&gt; &lt;username&gt; <span class="o">[</span>&lt;password&gt;<span class="o">]</span>
</code></pre></div>
<p>An example configuration file looks like this:</p>
<div class="highlight"><pre><span></span><code>@domain1.com relay_user_1:password_1
@domain2.com relay_user_2:password_2
</code></pre></div>
<p>If there is no other configuration, this will cause Postfix to deliver email through the relay specified in <code>RELAY_HOST</code> env variable, authenticating as <code>relay_user_1</code> when sent from <code>domain1.com</code> and authenticating as <code>relay_user_2</code> when sending from <code>domain2.com</code>.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>To activate the configuration you must either restart the container, or you can also trigger an update by modifying a mail account.</p>
</div>
<h3 id="sender-dependent-relay-host"><a class="toclink" href="#sender-dependent-relay-host">Sender-dependent Relay Host</a></h3>
<p>Sender dependent relay hosts are configured in <code>docker-data/dms/config/postfix-relaymap.cf</code>. You can create this file manually, or use:</p>
<div class="highlight"><pre><span></span><code>setup.sh relay add-domain &lt;domain&gt; &lt;host&gt; <span class="o">[</span>&lt;port&gt;<span class="o">]</span>
</code></pre></div>
<p>An example configuration file looks like this:</p>
<div class="highlight"><pre><span></span><code>@domain1.com [relay1.org]:587
@domain2.com [relay2.org]:2525
</code></pre></div>
<p>Combined with the previous configuration in <code>docker-data/dms/config/postfix-sasl-password.cf</code>, this will cause Postfix to deliver mail sent from <code>domain1.com</code> via <code>relay1.org:587</code>, authenticating as <code>relay_user_1</code>, and mail sent from <code>domain2.com</code> via <code>relay2.org:2525</code> authenticating as <code>relay_user_2</code>.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>You still have to define <code>RELAY_HOST</code> to activate the feature</p>
</div>
<h3 id="excluding-sender-domains"><a class="toclink" href="#excluding-sender-domains">Excluding Sender Domains</a></h3>
<p>If you want mail sent from some domains to be delivered directly, you can exclude them from being delivered via the default relay by adding them to <code>docker-data/dms/config/postfix-relaymap.cf</code> with no destination. You can also do this via:</p>
<div class="highlight"><pre><span></span><code>setup.sh relay exclude-domain &lt;domain&gt;
</code></pre></div>
<p>Extending the configuration file from above:</p>
<div class="highlight"><pre><span></span><code>@domain1.com [relay1.org]:587
@domain2.com [relay2.org]:2525
@domain3.com
</code></pre></div>
<p>This will cause email sent from <code>domain3.com</code> to be delivered directly.</p>
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