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edge/examples/use-cases/bind-smtp-network-interface/index.html
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@ -2286,23 +2286,23 @@ to the respective IP-address on the server you want to use.</p>
<div class="tabbed-set tabbed-alternate" data-tabs="1:2"><input checked="checked" id="contributed-solution" name="__tabbed_1" type="radio" /><input id="alternative-unverified" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="contributed-solution">Contributed solution</label><label for="alternative-unverified">Alternative (unverified)</label></div>
<div class="tabbed-content">
<div class="tabbed-block">
<p><code>title="postfix-main.cf"
smtp_bind_address = 198.51.100.42
smtp_bind_address6 = 2001:DB8::42</code></p>
<div class="highlight"><span class="filename">postfix-main.cf</span><pre><span></span><code>smtp_bind_address = 198.51.100.42
smtp_bind_address6 = 2001:DB8::42
</code></pre></div>
<div class="admonition bug">
<p class="admonition-title">Inheriting the bind from <code>main.cf</code> can misconfigure services</p>
<p>One problem when setting <code>smtp_bind_address</code> in <code>main.cf</code> is that it will be inherited by any services in <code>master.cf</code> that extend the <code>smtp</code> transport. One of these is <code>smtp-amavis</code>, which is explicitly configured to listen / connect via loopback (localhost / <code>127.0.0.1</code>).</p>
<p>A <code>postfix-master.cf</code> override can workaround that issue by ensuring <code>smtp-amavis</code> binds to the expected internal IP:</p>
<p><code>title="postfix-master.cf"
smtp-amavis/unix/smtp_bind_address=127.0.0.1
smtp-amavis/unix/smtp_bind_address6=::1</code></p>
<div class="highlight"><span class="filename">postfix-master.cf</span><pre><span></span><code>smtp-amavis/unix/smtp_bind_address=127.0.0.1
smtp-amavis/unix/smtp_bind_address6=::1
</code></pre></div>
</div>
</div>
<div class="tabbed-block">
<p>A potentially better solution might be to instead <a href="https://github.com/docker-mailserver/docker-mailserver/pull/3465#issuecomment-1678107233">explicitly set the <code>smtp_bind_address</code> override on the <code>smtp</code> transport service</a>:</p>
<p><code>title="postfix-master.cf"
smtp/inet/smtp_bind_address = 198.51.100.42
smtp/inet/smtp_bind_address6 = 2001:DB8::42</code></p>
<div class="highlight"><span class="filename">postfix-master.cf</span><pre><span></span><code>smtp/inet/smtp_bind_address = 198.51.100.42
smtp/inet/smtp_bind_address6 = 2001:DB8::42
</code></pre></div>
<p>If that avoids the concern with <code>smtp-amavis</code>, you may still need to additionally override for the <a href="https://github.com/docker-mailserver/docker-mailserver/blob/9cdbef2b369fb4fb0f1b4e534da8703daf92abc9/target/postfix/master.cf#L65"><code>relay</code> transport</a> as well if you have configured DMS to relay mail.</p>
</div>
</div>
@ -2376,7 +2376,7 @@ smtp/inet/smtp_bind_address6 = 2001:DB8::42</code></p>
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