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<h1>Fail2Ban</h1>
<p>Fail2Ban is installed automatically and bans IP addresses for 3 hours after 3 failed attempts in 10 minutes by default.</p>
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<h1>Fail2Ban</h1>
<p>Fail2Ban is installed automatically and bans IP addresses for 3 hours after 3 failed attempts in 10 minutes by default.</p>
<h2 id="configuration-files"><a class="toclink" href="#configuration-files">Configuration files</a></h2>
<p>If you want to change this, you can easily edit our github example file: <a href="https://github.com/docker-mailserver/docker-mailserver/blob/master/config/fail2ban-jail.cf"><code>config/fail2ban-jail.cf</code></a>.</p>
<p>You can do the same with the values from <code>fail2ban.conf</code>, e.g <code>dbpurgeage</code>. In that case you need to edit: <a href="https://github.com/docker-mailserver/docker-mailserver/blob/master/config/fail2ban-fail2ban.cf"><code>config/fail2ban-fail2ban.cf</code></a>.</p>
@ -1702,13 +1701,6 @@ Environment=&quot;DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER=slirp4netns&quot;
<p>Here <code>192.168.1.15</code> is our banned IP.</p>
<div class="highlight"><pre><span></span><code>./setup.sh debug fail2ban unban <span class="m">192</span>.168.1.15
</code></pre></div>
</article>
@ -1722,8 +1714,7 @@ Environment=&quot;DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER=slirp4netns&quot;
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<h1>Mail Encryption</h1>
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<h1>Mail Encryption</h1>
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<p class="admonition-title">Info</p>
<p>The Mail crypt plugin is used to secure email messages stored in a Dovecot system. Messages are encrypted before written to storage and decrypted after reading. Both operations are transparent to the user.</p>
<p>In case of unauthorized access to the storage backend, the messages will, without access to the decryption keys, be unreadable to the offending party.</p>
@ -1548,13 +1547,6 @@ T<>9<EFBFBD>8t<38>6<EFBFBD><36> t<><74><EFBFBD>e<EFBFBD>W<EFBFBD><57>S `<60>H<EFBFBD><48>C<EFBFBD>ڤ <20>yeY<65><59>XZ
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<p>This should be the minimum required for encryption of the mail while in storage.</p>
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@ -1568,8 +1560,7 @@ T<>9<EFBFBD>8t<38>6<EFBFBD><36> t<><74><EFBFBD>e<EFBFBD>W<EFBFBD><57>S `<60>H<EFBFBD><48>C<EFBFBD>ڤ <20>yeY<65><59>XZ
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<h1>SSL/TLS</h1>
<p>There are multiple options to enable SSL (via <a href="../../environment/#ssl_type"><code>SSL_TYPE</code></a>):</p>
<a href="https://github.com/docker-mailserver/docker-mailserver/edit/master/docs/content/config/security/ssl.md" title="Edit this page" class="md-content__button md-icon">
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<h1>SSL/TLS</h1>
<p>There are multiple options to enable SSL (via <a href="../../environment/#ssl_type"><code>SSL_TYPE</code></a>):</p>
<ul>
<li>Using <a href="#lets-encrypt-recommended">letsencrypt</a> (recommended)</li>
<li>Using <a href="#caddy">Caddy</a></li>
@ -1921,7 +1920,9 @@ docker run --detach <span class="se">\</span>
</ol>
<h4 id="example-using-nginx-proxy-and-acme-companion-with-docker-compose"><a class="toclink" href="#example-using-nginx-proxy-and-acme-companion-with-docker-compose">Example using <code>nginx-proxy</code> and <code>acme-companion</code> with <code>docker-compose</code></a></h4>
<p>The following example is the <a href="https://github.com/nginx-proxy/acme-companion#basic-usage-with-the-nginx-proxy-container">basic setup</a> you need for using <code>nginx-proxy</code> and <code>acme-companion</code> with <code>docker-mailserver</code> (<em>Referencing: <a href="https://github.com/nginx-proxy/acme-companion/blob/main/docs"><code>acme-companion</code> documentation</a></em>):</p>
<details class="example" open="open"><summary>Example: <code>docker-compose.yml</code></summary><p>You should have an existing <code>docker-compose.yml</code> with a <code>mailserver</code> service. Below are the modifications to add for integrating with <code>nginx-proxy</code> and <code>acme-companion</code> services:</p>
<details class="example" open="open">
<summary>Example: <code>docker-compose.yml</code></summary>
<p>You should have an existing <code>docker-compose.yml</code> with a <code>mailserver</code> service. Below are the modifications to add for integrating with <code>nginx-proxy</code> and <code>acme-companion</code> services:</p>
<div class="highlight"><pre><span></span><code><span class="nt">version</span><span class="p">:</span> <span class="s">&#39;3.8&#39;</span>
<span class="nt">services</span><span class="p">:</span>
<span class="c1"># Add the following `environment` and `volumes` to your existing `mailserver` service:</span>
@ -2066,7 +2067,9 @@ docker run --detach <span class="se">\</span>
}
</code></pre></div>
<p>If you are instead using a json config for Caddy v2, you can set it in your site's TLS automation policies:</p>
<details class="example" open="open"><summary>Example Code</summary><div class="highlight"><pre><span></span><code><span class="p">{</span>
<details class="example" open="open">
<summary>Example Code</summary>
<div class="highlight"><pre><span></span><code><span class="p">{</span>
<span class="nt">&quot;apps&quot;</span><span class="p">:</span> <span class="p">{</span>
<span class="nt">&quot;http&quot;</span><span class="p">:</span> <span class="p">{</span>
<span class="nt">&quot;servers&quot;</span><span class="p">:</span> <span class="p">{</span>
@ -2152,7 +2155,9 @@ docker run --detach <span class="se">\</span>
<li><code class="highlight"><span class="si">${</span><span class="nv">DOMAINNAME</span><span class="si">}</span></code></li>
</ol>
<p>This setup only comes with one caveat: The domain has to be configured on another service for <a href="https://github.com/containous/traefik">Traefik</a> to actually request it from <em>Let's Encrypt</em>, i.e. <a href="https://github.com/containous/traefik">Traefik</a> will not issue a certificate without a service / router demanding it.</p>
<details class="example" open="open"><summary>Example Code</summary><p>Here is an example setup for <a href="https://docs.docker.com/compose/"><code>docker-compose</code></a>:</p>
<details class="example" open="open">
<summary>Example Code</summary>
<p>Here is an example setup for <a href="https://docs.docker.com/compose/"><code>docker-compose</code></a>:</p>
<div class="highlight"><pre><span></span><code><span class="nt">version</span><span class="p">:</span> <span class="s">&#39;3.8&#39;</span>
<span class="nt">services</span><span class="p">:</span>
<span class="nt">mailserver</span><span class="p">:</span>
@ -2402,13 +2407,6 @@ openssl s_client <span class="se">\</span>
<h2 id="custom-dh-parameters"><a class="toclink" href="#custom-dh-parameters">Custom DH Parameters</a></h2>
<p>By default <code>docker-mailserver</code> uses <a href="https://github.com/internetstandards/dhe_groups"><code>ffdhe4096</code></a> from <a href="https://datatracker.ietf.org/doc/html/rfc7919">IETF RFC 7919</a>. These are standardized pre-defined DH groups and the only available DH groups for TLS 1.3. It is <a href="https://crypto.stackexchange.com/questions/29926/what-diffie-hellman-parameters-should-i-use">discouraged to generate your own DH parameters</a> as it is often less secure.</p>
<p>Despite this, if you must use non-standard DH parameters or you would like to swap <code>ffdhe4096</code> for a different group (eg <code>ffdhe2048</code>); Add your own PEM encoded DH params file via a volume to <code>/tmp/docker-mailserver/dhparams.pem</code>. This will replace DH params for both Dovecot and Postfix services during container startup.</p>
</article>
@ -2422,8 +2420,7 @@ openssl s_client <span class="se">\</span>
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@ -2462,20 +2459,19 @@ openssl s_client <span class="se">\</span>
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@ -9,14 +9,13 @@
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<h1>Understanding the Ports</h1>
<h2 id="quick-reference"><a class="toclink" href="#quick-reference">Quick Reference</a></h2>
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<h1>Understanding the Ports</h1>
<h2 id="quick-reference"><a class="toclink" href="#quick-reference">Quick Reference</a></h2>
<p>Prefer Implicit TLS ports, they're more secure and if you use a Reverse Proxy, should be less hassle (although it's probably wiser to expose these ports directly to <code>docker-mailserver</code>).</p>
<h2 id="overview-of-email-ports"><a class="toclink" href="#overview-of-email-ports">Overview of Email Ports</a></h2>
<table>
@ -1710,7 +1709,9 @@
</ol>
<h3 id="what-ports-should-i-use-smtp"><a class="toclink" href="#what-ports-should-i-use-smtp">What Ports Should I Use? (SMTP)</a></h3>
<p><a href="https://mermaid-js.github.io/mermaid-live-editor/#/edit/eyJjb2RlIjoiZmxvd2NoYXJ0IExSXG4gICAgc3ViZ3JhcGggeW91ci1zZXJ2ZXIgW1wiWW91ciBTZXJ2ZXJcIl1cbiAgICAgICAgaW5fMjUoMjUpIC0tPiBzZXJ2ZXJcbiAgICAgICAgaW5fNDY1KDQ2NSkgLS0-IHNlcnZlclxuICAgICAgICBzZXJ2ZXIoKFwiZG9ja2VyLW1haWxzZXJ2ZXI8YnIvPmhlbGxvQHdvcmxkLmNvbVwiKSlcbiAgICAgICAgc2VydmVyIC0tLSBvdXRfMjUoMjUpXG4gICAgICAgIHNlcnZlciAtLS0gb3V0XzQ2NSg0NjUpXG4gICAgZW5kXG5cbiAgICB0aGlyZC1wYXJ0eShcIlRoaXJkLXBhcnR5PGJyLz4oc2VuZGluZyB5b3UgZW1haWwpXCIpIC0tLXxcIlJlY2VpdmUgZW1haWwgZm9yPGJyLz5oZWxsb0B3b3JsZC5jb21cInwgaW5fMjVcblxuICAgIHN1YmdyYXBoIGNsaWVudHMgW1wiQ2xpZW50cyAoTVVBKVwiXVxuICAgICAgICBtdWEtY2xpZW50KFRodW5kZXJiaXJkLDxici8-V2VibWFpbCw8YnIvPk11dHQsPGJyLz5ldGMpXG4gICAgICAgIG11YS1zZXJ2aWNlKEJhY2tlbmQgc29mdHdhcmU8YnIvPm9uIGFub3RoZXIgc2VydmVyKVxuICAgIGVuZFxuICAgIGNsaWVudHMgLS0tfFwiU2VuZCBlbWFpbCBhczxici8-aGVsbG9Ad29ybGQuY29tXCJ8IGluXzQ2NVxuXG4gICAgb3V0XzI1KDI1KSAtLT58XCJEaXJlY3Q8YnIvPkRlbGl2ZXJ5XCJ8IHRpbl8yNVxuICAgIG91dF80NjUoNDY1KSAtLT4gcmVsYXkoXCJNVEE8YnIvPlJlbGF5IFNlcnZlclwiKSAtLT4gdGluXzI1KDI1KVxuXG4gICAgc3ViZ3JhcGggdGhpcmQtcGFydHktc2VydmVyW1wiVGhpcmQtcGFydHkgU2VydmVyXCJdXG4gICAgICAgIHRoaXJkLXBhcnR5LW10YShcIk1UQTxici8-ZnJpZW5kQGV4YW1wbGUuY29tXCIpXG4gICAgICAgIHRpbl8yNSgyNSkgLS0-IHRoaXJkLXBhcnR5LW10YVxuICAgIGVuZCIsIm1lcm1haWQiOnsidGhlbWUiOiJkZWZhdWx0In0sInVwZGF0ZUVkaXRvciI6ZmFsc2V9"><img alt="Best Practice - Ports (SMTP)" src="https://mermaid.ink/img/eyJjb2RlIjoiZmxvd2NoYXJ0IExSXG4gICAgc3ViZ3JhcGggeW91ci1zZXJ2ZXIgW1wiWW91ciBTZXJ2ZXJcIl1cbiAgICAgICAgaW5fMjUoMjUpIC0tPiBzZXJ2ZXJcbiAgICAgICAgaW5fNDY1KDQ2NSkgLS0-IHNlcnZlclxuICAgICAgICBzZXJ2ZXIoKFwiZG9ja2VyLW1haWxzZXJ2ZXI8YnIvPmhlbGxvQHdvcmxkLmNvbVwiKSlcbiAgICAgICAgc2VydmVyIC0tLSBvdXRfMjUoMjUpXG4gICAgICAgIHNlcnZlciAtLS0gb3V0XzQ2NSg0NjUpXG4gICAgZW5kXG5cbiAgICB0aGlyZC1wYXJ0eShcIlRoaXJkLXBhcnR5PGJyLz4oc2VuZGluZyB5b3UgZW1haWwpXCIpIC0tLXxcIlJlY2VpdmUgZW1haWwgZm9yPGJyLz5oZWxsb0B3b3JsZC5jb21cInwgaW5fMjVcblxuICAgIHN1YmdyYXBoIGNsaWVudHMgW1wiQ2xpZW50cyAoTVVBKVwiXVxuICAgICAgICBtdWEtY2xpZW50KFRodW5kZXJiaXJkLDxici8-V2VibWFpbCw8YnIvPk11dHQsPGJyLz5ldGMpXG4gICAgICAgIG11YS1zZXJ2aWNlKEJhY2tlbmQgc29mdHdhcmU8YnIvPm9uIGFub3RoZXIgc2VydmVyKVxuICAgIGVuZFxuICAgIGNsaWVudHMgLS0tfFwiU2VuZCBlbWFpbCBhczxici8-aGVsbG9Ad29ybGQuY29tXCJ8IGluXzQ2NVxuXG4gICAgb3V0XzI1KDI1KSAtLT58XCJEaXJlY3Q8YnIvPkRlbGl2ZXJ5XCJ8IHRpbl8yNVxuICAgIG91dF80NjUoNDY1KSAtLT4gcmVsYXkoXCJNVEE8YnIvPlJlbGF5IFNlcnZlclwiKSAtLT4gdGluXzI1KDI1KVxuXG4gICAgc3ViZ3JhcGggdGhpcmQtcGFydHktc2VydmVyW1wiVGhpcmQtcGFydHkgU2VydmVyXCJdXG4gICAgICAgIHRoaXJkLXBhcnR5LW10YShcIk1UQTxici8-ZnJpZW5kQGV4YW1wbGUuY29tXCIpXG4gICAgICAgIHRpbl8yNSgyNSkgLS0-IHRoaXJkLXBhcnR5LW10YVxuICAgIGVuZCIsIm1lcm1haWQiOnsidGhlbWUiOiJkZWZhdWx0In0sInVwZGF0ZUVkaXRvciI6ZmFsc2V9" /></a></p>
<details><summary>Flowchart - Mermaid.js source:</summary><p>View in the <a href="https://mermaid-js.github.io/mermaid-live-editor/#/edit/eyJjb2RlIjoiZmxvd2NoYXJ0IExSXG4gICAgc3ViZ3JhcGggeW91ci1zZXJ2ZXIgW1wiWW91ciBTZXJ2ZXJcIl1cbiAgICAgICAgaW5fMjUoMjUpIC0tPiBzZXJ2ZXJcbiAgICAgICAgaW5fNDY1KDQ2NSkgLS0-IHNlcnZlclxuICAgICAgICBzZXJ2ZXIoKFwiZG9ja2VyLW1haWxzZXJ2ZXI8YnIvPmhlbGxvQHdvcmxkLmNvbVwiKSlcbiAgICAgICAgc2VydmVyIC0tLSBvdXRfMjUoMjUpXG4gICAgICAgIHNlcnZlciAtLS0gb3V0XzQ2NSg0NjUpXG4gICAgZW5kXG5cbiAgICB0aGlyZC1wYXJ0eShcIlRoaXJkLXBhcnR5PGJyLz4oc2VuZGluZyB5b3UgZW1haWwpXCIpIC0tLXxcIlJlY2VpdmUgZW1haWwgZm9yPGJyLz5oZWxsb0B3b3JsZC5jb21cInwgaW5fMjVcblxuICAgIHN1YmdyYXBoIGNsaWVudHMgW1wiQ2xpZW50cyAoTVVBKVwiXVxuICAgICAgICBtdWEtY2xpZW50KFRodW5kZXJiaXJkLDxici8-V2VibWFpbCw8YnIvPk11dHQsPGJyLz5ldGMpXG4gICAgICAgIG11YS1zZXJ2aWNlKEJhY2tlbmQgc29mdHdhcmU8YnIvPm9uIGFub3RoZXIgc2VydmVyKVxuICAgIGVuZFxuICAgIGNsaWVudHMgLS0tfFwiU2VuZCBlbWFpbCBhczxici8-aGVsbG9Ad29ybGQuY29tXCJ8IGluXzQ2NVxuXG4gICAgb3V0XzI1KDI1KSAtLT58XCJEaXJlY3Q8YnIvPkRlbGl2ZXJ5XCJ8IHRpbl8yNVxuICAgIG91dF80NjUoNDY1KSAtLT4gcmVsYXkoXCJNVEE8YnIvPlJlbGF5IFNlcnZlclwiKSAtLT4gdGluXzI1KDI1KVxuXG4gICAgc3ViZ3JhcGggdGhpcmQtcGFydHktc2VydmVyW1wiVGhpcmQtcGFydHkgU2VydmVyXCJdXG4gICAgICAgIHRoaXJkLXBhcnR5LW10YShcIk1UQTxici8-ZnJpZW5kQGV4YW1wbGUuY29tXCIpXG4gICAgICAgIHRpbl8yNSgyNSkgLS0-IHRoaXJkLXBhcnR5LW10YVxuICAgIGVuZCIsIm1lcm1haWQiOnsidGhlbWUiOiJkZWZhdWx0In0sInVwZGF0ZUVkaXRvciI6ZmFsc2V9">Live Editor</a>.</p>
<details>
<summary>Flowchart - Mermaid.js source:</summary>
<p>View in the <a href="https://mermaid-js.github.io/mermaid-live-editor/#/edit/eyJjb2RlIjoiZmxvd2NoYXJ0IExSXG4gICAgc3ViZ3JhcGggeW91ci1zZXJ2ZXIgW1wiWW91ciBTZXJ2ZXJcIl1cbiAgICAgICAgaW5fMjUoMjUpIC0tPiBzZXJ2ZXJcbiAgICAgICAgaW5fNDY1KDQ2NSkgLS0-IHNlcnZlclxuICAgICAgICBzZXJ2ZXIoKFwiZG9ja2VyLW1haWxzZXJ2ZXI8YnIvPmhlbGxvQHdvcmxkLmNvbVwiKSlcbiAgICAgICAgc2VydmVyIC0tLSBvdXRfMjUoMjUpXG4gICAgICAgIHNlcnZlciAtLS0gb3V0XzQ2NSg0NjUpXG4gICAgZW5kXG5cbiAgICB0aGlyZC1wYXJ0eShcIlRoaXJkLXBhcnR5PGJyLz4oc2VuZGluZyB5b3UgZW1haWwpXCIpIC0tLXxcIlJlY2VpdmUgZW1haWwgZm9yPGJyLz5oZWxsb0B3b3JsZC5jb21cInwgaW5fMjVcblxuICAgIHN1YmdyYXBoIGNsaWVudHMgW1wiQ2xpZW50cyAoTVVBKVwiXVxuICAgICAgICBtdWEtY2xpZW50KFRodW5kZXJiaXJkLDxici8-V2VibWFpbCw8YnIvPk11dHQsPGJyLz5ldGMpXG4gICAgICAgIG11YS1zZXJ2aWNlKEJhY2tlbmQgc29mdHdhcmU8YnIvPm9uIGFub3RoZXIgc2VydmVyKVxuICAgIGVuZFxuICAgIGNsaWVudHMgLS0tfFwiU2VuZCBlbWFpbCBhczxici8-aGVsbG9Ad29ybGQuY29tXCJ8IGluXzQ2NVxuXG4gICAgb3V0XzI1KDI1KSAtLT58XCJEaXJlY3Q8YnIvPkRlbGl2ZXJ5XCJ8IHRpbl8yNVxuICAgIG91dF80NjUoNDY1KSAtLT4gcmVsYXkoXCJNVEE8YnIvPlJlbGF5IFNlcnZlclwiKSAtLT4gdGluXzI1KDI1KVxuXG4gICAgc3ViZ3JhcGggdGhpcmQtcGFydHktc2VydmVyW1wiVGhpcmQtcGFydHkgU2VydmVyXCJdXG4gICAgICAgIHRoaXJkLXBhcnR5LW10YShcIk1UQTxici8-ZnJpZW5kQGV4YW1wbGUuY29tXCIpXG4gICAgICAgIHRpbl8yNSgyNSkgLS0-IHRoaXJkLXBhcnR5LW10YVxuICAgIGVuZCIsIm1lcm1haWQiOnsidGhlbWUiOiJkZWZhdWx0In0sInVwZGF0ZUVkaXRvciI6ZmFsc2V9">Live Editor</a>.</p>
<div class="highlight"><pre><span></span><code>flowchart LR
subgraph your-server [&quot;Your Server&quot;]
in_25(25) --&gt; server
@ -1770,13 +1771,6 @@
<h3 id="tls-connections-for-a-mail-server-compared-to-web-browsers"><a class="toclink" href="#tls-connections-for-a-mail-server-compared-to-web-browsers">TLS connections for a Mail-Server, compared to web browsers</a></h3>
<p>Unlike with HTTP where a web browser client communicates directly with the server providing a website, a secure TLS connection as discussed below is not the equivalent safety that HTTPS provides when the transit of email (receiving or sending) is sent through third-parties, as the secure connection is only between two machines, any additional machines (MTAs) between the MUA and the MDA depends on them establishing secure connections between one another successfully.</p>
<p>Other machines that facilitate a connection that generally aren't taken into account can exist between a client and server, such as those where your connection passes through your ISP provider are capable of compromising a cleartext connection through interception.</p>
</article>
@ -1790,8 +1784,7 @@
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