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<meta name="description" content="A fullstack but simple mail-server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) using Docker.">
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<meta name="author" content="docker-mailserver (Github Organization)">
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<link rel="canonical" href="https://docker-mailserver.github.io/docker-mailserver/edge/examples/tutorials/mailserver-behind-proxy/">
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@ -1174,7 +1175,6 @@
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<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
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@ -1479,7 +1479,6 @@
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<div class="md-sidebar__inner">
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<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
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@ -1537,14 +1536,14 @@
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<article class="md-content__inner md-typeset">
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<a href="https://github.com/docker-mailserver/docker-mailserver/edit/master/docs/content/examples/tutorials/mailserver-behind-proxy.md" title="Edit this page" class="md-content__button md-icon">
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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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</a>
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<h1>Mailserver behind Proxy</h1>
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<h2 id="using-docker-mailserver-behind-a-proxy"><a class="toclink" href="#using-docker-mailserver-behind-a-proxy">Using <code>docker-mailserver</code> behind a Proxy</a></h2>
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<a href="https://github.com/docker-mailserver/docker-mailserver/edit/master/docs/content/examples/tutorials/mailserver-behind-proxy.md" title="Edit this page" class="md-content__button md-icon">
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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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</a>
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<h1>Mailserver behind Proxy</h1>
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<h2 id="using-docker-mailserver-behind-a-proxy"><a class="toclink" href="#using-docker-mailserver-behind-a-proxy">Using <code>docker-mailserver</code> behind a Proxy</a></h2>
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<h3 id="information"><a class="toclink" href="#information">Information</a></h3>
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<p>If you are hiding your container behind a proxy service you might have discovered that the proxied requests from now on contain the proxy IP as the request origin. Whilst this behavior is technical correct it produces certain problems on the containers behind the proxy as they cannot distinguish the real origin of the requests anymore.</p>
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<p>To solve this problem on TCP connections we can make use of the <a href="https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt">proxy protocol</a>. Compared to other workarounds that exist (<code>X-Forwarded-For</code> which only works for HTTP requests or <code>Tproxy</code> that requires you to recompile your kernel) the proxy protocol:</p>
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<h3 id="configuration-of-the-used-proxy-software"><a class="toclink" href="#configuration-of-the-used-proxy-software">Configuration of the used Proxy Software</a></h3>
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<p>The configuration depends on the used proxy system. I will provide the configuration examples of <a href="https://traefik.io/">traefik v2</a> using IMAP and SMTP with implicit TLS.</p>
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<p>Feel free to add your configuration if you achieved the same goal using different proxy software below:</p>
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<details><summary>Traefik v2</summary><p>Truncated configuration of traefik itself:</p>
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<details>
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<summary>Traefik v2</summary>
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<p>Truncated configuration of traefik itself:</p>
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<div class="highlight"><pre><span></span><code><span class="nt">version</span><span class="p">:</span> <span class="s">'3.8'</span>
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<span class="nt">services</span><span class="p">:</span>
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<span class="nt">reverse-proxy</span><span class="p">:</span>
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<p class="admonition-title">Note</p>
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<p>Port <code>10993</code> is used here to avoid conflicts with internal systems like <code>postscreen</code> and <code>amavis</code> as they will exchange messages on the default port and obviously have a different origin then compared to the proxy.</p>
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</div>
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</article>
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@ -1664,8 +1658,7 @@
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</main>
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<footer class="md-footer">
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<footer class="md-footer">
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<nav class="md-footer__inner md-grid" aria-label="Footer">
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@ -1704,20 +1697,19 @@
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<div class="md-footer-meta md-typeset">
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<div class="md-footer-meta__inner md-grid">
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<div class="md-footer-copyright">
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<div class="md-footer-copyright__highlight">
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<p>© <a href="https://github.com/docker-mailserver"><em>Docker Mailserver Organization</em></a><br/><span>This project is licensed under the MIT license.</span></p>
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</div>
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</div>
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<div class="md-copyright">
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<div class="md-copyright__highlight">
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<p>© <a href="https://github.com/docker-mailserver"><em>Docker Mailserver Organization</em></a><br/><span>This project is licensed under the MIT license.</span></p>
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</div>
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Made with
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</div>
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@ -1727,10 +1719,10 @@
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<div class="md-dialog" data-md-component="dialog">
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<div class="md-dialog__inner md-typeset"></div>
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<script id="__config" type="application/json">{"base": "../../..", "features": ["navigation.tabs", "navigation.top", "navigation.expand", "navigation.instant"], "translations": {"clipboard.copy": "Copy to clipboard", "clipboard.copied": "Copied to clipboard", "search.config.lang": "en", "search.config.pipeline": "trimmer, stopWordFilter", "search.config.separator": "[\\s\\-]+", "search.placeholder": "Search", "search.result.placeholder": "Type to start searching", "search.result.none": "No matching documents", "search.result.one": "1 matching document", "search.result.other": "# matching documents", "search.result.more.one": "1 more on this page", "search.result.more.other": "# more on this page", "search.result.term.missing": "Missing", "select.version.title": "Select version"}, "search": "../../../assets/javascripts/workers/search.fcfe8b6d.min.js", "version": {"provider": "mike"}}</script>
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<script id="__config" type="application/json">{"base": "../../..", "features": ["navigation.tabs", "navigation.top", "navigation.expand", "navigation.instant", "content.code.annotate"], "translations": {"clipboard.copy": "Copy to clipboard", "clipboard.copied": "Copied to clipboard", "search.config.lang": "en", "search.config.pipeline": "trimmer, stopWordFilter", "search.config.separator": "[\\s\\-]+", "search.placeholder": "Search", "search.result.placeholder": "Type to start searching", "search.result.none": "No matching documents", "search.result.one": "1 matching document", "search.result.other": "# matching documents", "search.result.more.one": "1 more on this page", "search.result.more.other": "# more on this page", "search.result.term.missing": "Missing", "select.version.title": "Select version"}, "search": "../../../assets/javascripts/workers/search.cefbb252.min.js", "version": {"provider": "mike"}}</script>
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<script src="../../../assets/javascripts/bundle.b1047164.min.js"></script>
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<script src="../../../assets/javascripts/bundle.17f42bbf.min.js"></script>
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