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Advanced | IPv6
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GHCR
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DKIM
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DMARC
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<a href="../../best-practices/spf/" class="md-nav__link">
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SPF
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Understanding the Ports
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Mail Encryption
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Troubleshooting
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Troubleshooting
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<a href="../../troubleshooting/debugging/" class="md-nav__link">
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Debugging
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Mail Delivery with POP3
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Optional Configuration
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Maintenance
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Maintenance
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<a href="../maintenance/update-and-cleanup/" class="md-nav__link">
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Update and Cleanup
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<label class="md-nav__link" for="__nav_4_8_3">
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Override the Default Configs
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<span class="md-nav__icon md-icon"></span>
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<nav class="md-nav" aria-label="Override the Default Configs" data-md-level="3">
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<label class="md-nav__title" for="__nav_4_8_3">
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Override the Default Configs
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Dovecot
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<li class="md-nav__item">
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<a href="../override-defaults/user-patches/" class="md-nav__link">
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Modifications via Script
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<a href="../auth-ldap/" class="md-nav__link">
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LDAP Authentication
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Email Filtering with Sieve
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<li class="md-nav__item">
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<a href="../mail-fetchmail/" class="md-nav__link">
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Email Gathering with Fetchmail
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</a>
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<li class="md-nav__item md-nav__item--nested">
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<label class="md-nav__link" for="__nav_4_8_7">
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Email Forwarding
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<span class="md-nav__icon md-icon"></span>
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</label>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25Z"/></svg>
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<h1>IPv6</h1>
|
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|
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<h2 id="background"><a class="toclink" href="#background">Background</a></h2>
|
|
<p>If your container host supports IPv6, then <code>docker-mailserver</code> will automatically accept IPv6 connections by way of the docker host's IPv6. However, incoming mail will fail SPF checks because they will appear to come from the IPv4 gateway that docker is using to proxy the IPv6 connection (<code>172.20.0.1</code> is the gateway).</p>
|
|
<p>This can be solved by supporting IPv6 connections all the way to the <code>docker-mailserver</code> container.</p>
|
|
<h2 id="setup-steps"><a class="toclink" href="#setup-steps">Setup steps</a></h2>
|
|
<div class="highlight"><pre><span></span><code><span class="gi">+++ b/serv/docker-compose.yml</span><span class="w"></span>
|
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<span class="gu">@@ -1,4 +1,4 @@</span><span class="w"></span>
|
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<span class="gd">-version: '2'</span><span class="w"></span>
|
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<span class="gi">+version: '2.1'</span><span class="w"></span>
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<span class="gu">@@ -32,6 +32,16 @@ services:</span><span class="w"></span>
|
|
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<span class="gi">+ ipv6nat:</span><span class="w"></span>
|
|
<span class="gi">+ image: robbertkl/ipv6nat</span><span class="w"></span>
|
|
<span class="gi">+ restart: always</span><span class="w"></span>
|
|
<span class="gi">+ network_mode: "host"</span><span class="w"></span>
|
|
<span class="gi">+ cap_add:</span><span class="w"></span>
|
|
<span class="gi">+ - NET_ADMIN</span><span class="w"></span>
|
|
<span class="gi">+ - SYS_MODULE</span><span class="w"></span>
|
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<span class="gi">+ volumes:</span><span class="w"></span>
|
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<span class="gi">+ - /var/run/docker.sock:/var/run/docker.sock:ro</span><span class="w"></span>
|
|
<span class="gi">+ - /lib/modules:/lib/modules:ro</span><span class="w"></span>
|
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<span class="gu">@@ -306,4 +316,13 @@ networks:</span><span class="w"></span>
|
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|
|
<span class="gi">+ default:</span><span class="w"></span>
|
|
<span class="gi">+ driver: bridge</span><span class="w"></span>
|
|
<span class="gi">+ enable_ipv6: true</span><span class="w"></span>
|
|
<span class="gi">+ ipam:</span><span class="w"></span>
|
|
<span class="gi">+ driver: default</span><span class="w"></span>
|
|
<span class="gi">+ config:</span><span class="w"></span>
|
|
<span class="gi">+ - subnet: fd00:0123:4567::/48</span><span class="w"></span>
|
|
<span class="gi">+ gateway: fd00:0123:4567::1</span><span class="w"></span>
|
|
</code></pre></div>
|
|
<h2 id="further-discussion"><a class="toclink" href="#further-discussion">Further Discussion</a></h2>
|
|
<p>See <a href="https://github.com/docker-mailserver/docker-mailserver/issues/1438">#1438</a></p>
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