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<h1>MTA-STS</h1>
<p>MTA-STS is an optional mechanism for a domain to signal support for STARTTLS.</p>
<ul>
<li>It can be used to prevent man-in-the-middle-attacks from hiding STARTTLS support that would force DMS to send outbound mail through an insecure connection.</li>
<li>MTA-STS is an alternative to DANE without the need of DNSSEC.</li>
<li>MTA-STS is supported by some of the biggest mail providers like Google Mail and Outlook.</li>
</ul>
<h2 id="supporting-mta-sts-for-outbound-mail"><a class="toclink" href="#supporting-mta-sts-for-outbound-mail">Supporting MTA-STS for outbound mail</a></h2>
<p>Enable this feature via the ENV setting <a href="../../environment/#enable_mta_sts"><code>ENABLE_MTA_STS=1</code></a>.</p>
<div class="admonition warning">
<p class="admonition-title">If you have configured DANE</p>
<p>Enabling MTA-STS will by default override DANE if both are configured for a domain.</p>
<p>This can be partially addressed by configuring a dane-only policy resolver before the MTA-STS entry in <code>smtp_tls_policy_maps</code>. See the <a href="https://github.com/Snawoot/postfix-mta-sts-resolver#warning-mta-sts-policy-overrides-dane-tls-authentication"><code>postfix-mta-sts-resolver</code> documentation</a> for further details.</p>
</div>
<h2 id="supporting-mta-sts-for-inbound-mail"><a class="toclink" href="#supporting-mta-sts-for-inbound-mail">Supporting MTA-STS for inbound mail</a></h2>
<p>While this feature in DMS supports ensuring STARTTLS is used when mail is sent to another mail server, you may setup similar for mail servers sending mail to DMS.</p>
<p>This requires configuring your DNS and hosting the MTA-STS policy file via a webserver. A good introduction can be found on <a href="https://dmarcian.com/mta-sts/">dmarcian.com</a>.</p>
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