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<h1>Basic Installation</h1>
<h2 id="setting-up-a-simple-mail-server"><a class="toclink" href="#setting-up-a-simple-mail-server">Setting up a Simple Mail-Server</a></h2>
<p>This is a community contributed guide. Please let us know via a Github Issue if you're having any difficulty following the guide so that we can update it.</p>
<p>This guide is focused on only using <a href="../../../config/security/understanding-the-ports/">SMTP ports (not POP3 and IMAP)</a> with the intent to send received mail to another MTA service such as <em>Gmail</em>. It is not intended to have a MUA client (<em>eg: Thunderbird</em>) to retrieve mail directly from <code>docker-mailserver</code> via POP3/IMAP.</p>
<p>In this setup <code>docker-mailserver</code> is not intended to receive email externally, so no anti-spam or anti-virus software is needed, making the service lighter to run.</p>
<div class="admonition warning">
<p class="admonition-title">Open Relays</p>
<p>Adding the docker network's gateway to the list of trusted hosts (<em>eg: using the <code>network</code> or <code>connected-networks</code> option</em>), can create an <a href="https://en.wikipedia.org/wiki/Open_mail_relay"><strong>open relay</strong></a>. For instance <a href="https://github.com/docker-mailserver/docker-mailserver/issues/1405#issuecomment-590106498">if IPv6 is enabled on the host machine, but not in Docker</a>.</p>
</div>
<ol>
<li>
<p>If you're running a version of <code>docker-mailserver</code> earlier than v10.2, <a href="../../../config/setup.sh/">you'll need to get <code>setup.sh</code></a>. Otherwise you can substitute <code>./setup.sh &lt;command&gt;</code> with <code>docker exec mailserver setup &lt;command&gt;</code>.</p>
</li>
<li>
<p>Pull the docker image: <code>docker pull docker.io/mailserver/docker-mailserver:latest</code>.</p>
</li>
<li>
<p>Create the file <code>docker-compose.yml</code> with a content like this:</p>
<div class="admonition example">
<p class="admonition-title">Example</p>
<div class="highlight"><pre><span></span><code><span class="nt">version</span><span class="p">:</span><span class="w"> </span><span class="s">&#39;3.8&#39;</span><span class="w"></span>
<span class="nt">services</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="nt">mailserver</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">docker.io/mailserver/docker-mailserver:latest</span><span class="w"></span>
<span class="w"> </span><span class="nt">container_name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">mailserver</span><span class="w"></span>
<span class="w"> </span><span class="nt">hostname</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">mail</span><span class="w"></span>
<span class="w"> </span><span class="c1"># Change this to your domain, it is used for your email accounts (eg: user@example.com):</span><span class="w"></span>
<span class="w"> </span><span class="nt">domainname</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">example.com</span><span class="w"></span>
<span class="w"> </span><span class="nt">ports</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="s">&quot;25:25&quot;</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="s">&quot;587:587&quot;</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="s">&quot;465:465&quot;</span><span class="w"></span>
<span class="w"> </span><span class="nt">volumes</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">./docker-data/dms/mail-data/:/var/mail/</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">./docker-data/dms/mail-state/:/var/mail-state/</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">./docker-data/dms/mail-logs/:/var/log/mail/</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">./docker-data/dms/config/:/tmp/docker-mailserver/</span><span class="w"></span>
<span class="w"> </span><span class="c1"># The &quot;from&quot; path will vary based on where your certs are locally:</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">./docker-data/nginx-proxy/certs/:/etc/letsencrypt/</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">/etc/localtime:/etc/localtime:ro</span><span class="w"></span>
<span class="w"> </span><span class="nt">environment</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ENABLE_FAIL2BAN=1</span><span class="w"></span>
<span class="w"> </span><span class="c1"># Using letsencrypt for SSL/TLS certificates</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">SSL_TYPE=letsencrypt</span><span class="w"></span>
<span class="w"> </span><span class="c1"># Allow sending emails from other docker containers</span><span class="w"></span>
<span class="w"> </span><span class="c1"># Beware creating an Open Relay: https://docker-mailserver.github.io/docker-mailserver/edge/config/environment/#permit_docker</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">PERMIT_DOCKER=network</span><span class="w"></span>
<span class="w"> </span><span class="c1"># All env below are default settings:</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">DMS_DEBUG=0</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ONE_DIR=1</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ENABLE_POSTGREY=0</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ENABLE_CLAMAV=0</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ENABLE_SPAMASSASSIN=0</span><span class="w"></span>
<span class="w"> </span><span class="c1"># You may want to enable this: https://docker-mailserver.github.io/docker-mailserver/edge/config/environment/#spoof_protection</span><span class="w"></span>
<span class="w"> </span><span class="c1"># See step 8 below, which demonstrates setup with enabled/disabled SPOOF_PROTECTION:</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">SPOOF_PROTECTION=0</span><span class="w"></span>
<span class="w"> </span><span class="nt">cap_add</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">NET_ADMIN</span><span class="w"> </span><span class="c1"># For Fail2Ban to work</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">SYS_PTRACE</span><span class="w"></span>
</code></pre></div>
</div>
<ul>
<li>The docs have a detailed page on <a href="../../../config/environment/">Environment Variables</a> for reference.</li>
</ul>
<div class="admonition note">
<p class="admonition-title">Firewalled ports</p>
<p>You may need to open ports <code>25</code>, <code>587</code> and <code>465</code> on the firewall. For example, with the firewall <code>ufw</code>, run:</p>
<div class="highlight"><pre><span></span><code>ufw allow <span class="m">25</span>
ufw allow <span class="m">587</span>
ufw allow <span class="m">465</span>
</code></pre></div>
</div>
</li>
<li>
<p>Configure your DNS service to use an MX record for the <em>hostname</em> (eg: <code>mail</code>) you configured in the previous step and add the <a href="../../../config/best-practices/spf/">SPF</a> TXT record.</p>
<p>If you manually manage the DNS zone file for the domain, it would look something like this:</p>
<div class="highlight"><pre><span></span><code>mail IN A 10.11.12.13
; mail-server for example.com
3600 IN MX 1 mail.example.com.
; Add SPF record
IN TXT &quot;v=spf1 mx ~all&quot;
</code></pre></div>
<p>Then don't forget to change the serial number and to restart the service.</p>
</li>
<li>
<p><a href="../../../config/best-practices/dkim/">Generate DKIM keys</a> for your domain via <code>./setup.sh config dkim</code>.</p>
<p>Copy the content of the file <code>docker-data/dms/config/opendkim/keys/example.com/mail.txt</code> and add it to your DNS records as a TXT like SPF was handled above.</p>
<p>I use <a href="https://github.com/docker-scripts/bind9">bind9</a> for managing my domains, so I just paste it on <code>example.com.db</code>:</p>
<div class="highlight"><pre><span></span><code>mail._domainkey IN TXT ( &quot;v=DKIM1; h=sha256; k=rsa; &quot;
&quot;p=MIIBIjANBgkqhkiG9w0BAQEFACAQ8AMIIBCgKCAQEAaH5KuPYPSF3Ppkt466BDMAFGOA4mgqn4oPjZ5BbFlYA9l5jU3bgzRj3l6/Q1n5a9lQs5fNZ7A/HtY0aMvs3nGE4oi+LTejt1jblMhV/OfJyRCunQBIGp0s8G9kIUBzyKJpDayk2+KJSJt/lxL9Iiy0DE5hIv62ZPP6AaTdHBAsJosLFeAzuLFHQ6USyQRojefqFQtgYqWQ2JiZQ3&quot;
&quot;iqq3bD/BVlwKRp5gH6TEYEmx8EBJUuDxrJhkWRUk2VDl1fqhVBy8A9O7Ah+85nMrlOHIFsTaYo9o6+cDJ6t1i6G1gu+bZD0d3/3bqGLPBQV9LyEL1Rona5V7TJBGg099NQkTz1IwIDAQAB&quot; ) ; ----- DKIM key mail for example.com
</code></pre></div>
</li>
<li>
<p>Get an SSL certificate, <a href="../../../config/security/ssl/#lets-encrypt-recommended">we have a guide for you here</a> (<em>Let's Encrypt</em> is a popular service to get free SSL certificates).</p>
</li>
<li>
<p>Start <code>docker-mailserver</code> and check the terminal output for any errors: <code>docker-compose up</code>.</p>
</li>
<li>
<p>Create email accounts and aliases:</p>
<div class="admonition example">
<p class="admonition-title">With <code>SPOOF_PROTECTION=0</code></p>
<div class="highlight"><pre><span></span><code>./setup.sh email add admin@example.com passwd123
./setup.sh email add info@example.com passwd123
./setup.sh <span class="nb">alias</span> add admin@example.com external-account@gmail.com
./setup.sh <span class="nb">alias</span> add info@example.com external-account@gmail.com
./setup.sh email list
./setup.sh <span class="nb">alias</span> list
</code></pre></div>
<p>Aliases make sure that any email that comes to these accounts is forwarded to your third-party email address (<code>external-account@gmail.com</code>), where they are retrieved (<em>eg: via third-party web or mobile app</em>), instead of connecting directly to <code>docker-mailserer</code> with POP3 / IMAP.</p>
</div>
<div class="admonition example">
<p class="admonition-title">With <code>SPOOF_PROTECTION=1</code></p>
<div class="highlight"><pre><span></span><code>./setup.sh email add admin.gmail@example.com passwd123
./setup.sh email add info.gmail@example.com passwd123
./setup.sh <span class="nb">alias</span> add admin@example.com admin.gmail@example.com
./setup.sh <span class="nb">alias</span> add info@example.com info.gmail@example.com
./setup.sh <span class="nb">alias</span> add admin.gmail@example.com external-account@gmail.com
./setup.sh <span class="nb">alias</span> add info.gmail@example.com external-account@gmail.com
./setup.sh email list
./setup.sh <span class="nb">alias</span> list
</code></pre></div>
<p>This extra step is required to avoid the <code>553 5.7.1 Sender address rejected: not owned by user</code> error (<em>the accounts used for submitting mail to Gmail are <code>admin.gmail@example.com</code> and <code>info.gmail@example.com</code></em>)</p>
</div>
</li>
<li>
<p>Send some test emails to these addresses and make other tests. Once everything is working well, stop the container with <code>ctrl+c</code> and start it again as a daemon: <code>docker-compose up -d</code>.</p>
</li>
</ol>
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