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32
edge/examples/use-cases/bind-smtp-network-interface/index.html
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to the respective IP-address on the server you want to use.</p>
<div class="admonition example">
<p class="admonition-title">Example</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-set tabbed-alternate" data-tabs="1:3"><input checked="checked" id="contributed-solution" name="__tabbed_1" type="radio" /><input id="alternative-unverified" name="__tabbed_1" type="radio" /><input id="bridged-networks" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="contributed-solution">Contributed solution</label><label for="alternative-unverified">Alternative (unverified)</label><label for="bridged-networks">Bridged Networks</label></div>
<div class="tabbed-content">
<div class="tabbed-block">
<div class="highlight"><span class="filename">postfix-main.cf</span><pre><span></span><code>smtp_bind_address = 198.51.100.42
@ -2305,12 +2305,40 @@ 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 class="tabbed-block">
<p>When your DMS container is using a bridge network, you'll instead need to restrict which IP address inbound and outbound traffic is routed through via the bridged interface.</p>
<p>For <strong>inbound</strong> traffic, you may configure this at whatever scope is most appropriate for you:</p>
<ul>
<li><strong>Daemon:</strong> Change the <a href="https://docs.docker.com/reference/cli/dockerd/#default-network-options">default bind address</a> configured in <code>/etc/docker/daemon.json</code> (default <code>0.0.0.0</code>)</li>
<li><strong>Network:</strong> Assign the <a href="https://docs.docker.com/engine/network/drivers/bridge/#default-host-binding-address"><code>host_binding_ipv4</code> bridge driver option</a> as shown in the below <code>compose.yaml</code> snippet.</li>
<li><strong>Container:</strong> Provide an explicit host IP address when <a href="https://docs.docker.com/reference/compose-file/services/#ports">publishing a port</a>.</li>
</ul>
<p>For <strong>outbound</strong> traffic, the bridge network will use the default route. You can change this by either:</p>
<ul>
<li><a href="https://github.com/moby/moby/issues/30053#issuecomment-1077041045">Manually routing networks</a> on the host.</li>
<li>Use the <a href="https://github.com/moby/libnetwork/pull/2454"><code>host_ipv4</code> driver option</a> for Docker networks to force the SNAT (source IP) that the bridged network will route outbound traffic through.<ul>
<li>This IP address must belong to a network interface to be routed through it.</li>
<li>IPv6 support via <code>host_ipv6</code> <a href="https://github.com/moby/moby/issues/46469">requires at least Docker v25</a>.</li>
</ul>
</li>
</ul>
<hr />
<p>Here is a <code>compose.yaml</code> snippet that applies the inbound + outbound settings to the default bridge network Docker Compose creates (<em>if it already exists, you will need to ensure it's re-created to apply the updated settings</em>):</p>
<div class="highlight"><span class="filename">compose.yaml</span><pre><span></span><code><span class="nt">networks</span><span class="p">:</span>
<span class="w"> </span><span class="nt">default</span><span class="p">:</span>
<span class="w"> </span><span class="nt">driver_opts</span><span class="p">:</span>
<span class="w"> </span><span class="c1"># Inbound IP (sets the host IP that published ports receive traffic from):</span>
<span class="w"> </span><span class="nt">com.docker.network.bridge.host_binding_ipv4</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">198.51.100.42</span>
<span class="w"> </span><span class="c1"># Outbound IP (sets the host IP that external hosts will receive connections from):</span>
<span class="w"> </span><span class="nt">com.docker.network.host_ipv4</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">198.51.100.42</span>
</code></pre></div>
</div>
</div>
</div>
</div>
<div class="admonition note">
<p class="admonition-title">IP addresses for documentation</p>
<p>IP addresses shown in above examples are placeholders, they are IP addresses reserved for documentation by IANA (<em><a href="https://datatracker.ietf.org/doc/html/rfc5737">RFC-5737 (IPv4)</a> and <a href="https://datatracker.ietf.org/doc/html/rfc3849">RFC-3849 (IPv6)</a></em>). Replace them with the IP addresses you want DMS to send mail through.</p>
<p>IP addresses shown in above examples (<code>198.51.100.42</code> + <code>2001:DB8::42</code>) are placeholders, they are IP addresses reserved for documentation by IANA (<em><a href="https://datatracker.ietf.org/doc/html/rfc5737">RFC-5737 (IPv4)</a> and <a href="https://datatracker.ietf.org/doc/html/rfc3849">RFC-3849 (IPv6)</a></em>). Replace them with the IP addresses you want DMS to send mail through.</p>
</div>

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edge/search/search_index.json
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edge/sitemap.xml
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<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/faq/</loc>
<lastmod>2025-02-02</lastmod>
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</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/introduction/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/usage/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/debugging/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/environment/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/pop3/</loc>
<lastmod>2025-02-02</lastmod>
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</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/setup.sh/</loc>
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</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/account-management/overview/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/account-management/provisioner/file/</loc>
<lastmod>2025-02-02</lastmod>
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</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/account-management/provisioner/ldap/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/account-management/supplementary/master-accounts/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/account-management/supplementary/oauth2/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/full-text-search/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/ipv6/</loc>
<lastmod>2025-02-02</lastmod>
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</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/kubernetes/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/mail-fetchmail/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/mail-getmail/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/mail-sieve/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/optional-config/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/podman/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/mail-forwarding/aws-ses/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/mail-forwarding/gmail-smtp/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/mail-forwarding/relay-hosts/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/maintenance/update-and-cleanup/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/override-defaults/dovecot/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/override-defaults/postfix/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/override-defaults/user-patches/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/best-practices/autodiscover/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/best-practices/dkim_dmarc_spf/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/best-practices/mta-sts/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/security/fail2ban/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/security/mail_crypt/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/security/rspamd/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/security/ssl/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/security/understanding-the-ports/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/contributing/general/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/contributing/issues-and-pull-requests/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/contributing/tests/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/examples/tutorials/basic-installation/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/examples/tutorials/blog-posts/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/examples/tutorials/crowdsec/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/examples/tutorials/docker-build/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/examples/tutorials/dovecot-solr/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/examples/tutorials/mailserver-behind-proxy/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/examples/use-cases/auth-lua/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/examples/use-cases/bind-smtp-network-interface/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/examples/use-cases/external-relay-only-mailserver/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/examples/use-cases/forward-only-mailserver-with-ldap-authentication/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/examples/use-cases/imap-folders/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/examples/use-cases/ios-mail-push-support/</loc>
<lastmod>2025-02-02</lastmod>
<lastmod>2025-02-03</lastmod>
</url>
</urlset>