docker-mailserver/edge/config/user-management/aliases/index.html
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<h1>Aliases</h1>
<p>Please read the <a href="http://www.postfix.org/VIRTUAL_README.html#virtual_alias">Postfix documentation on virtual aliases</a> first.</p>
<p>You can use <a href="../../setup.sh/"><code>setup.sh</code></a> instead of creating and editing files manually. Aliases are managed in <code>/tmp/docker-mailserver/postfix-virtual.cf</code>. An alias is a <em>full</em> email address that will either be:</p>
<ul>
<li>delivered to an existing account registered in <code>/tmp/docker-mailserver/postfix-accounts.cf</code></li>
<li>redirected to one or more other email addresses</li>
</ul>
<p>Alias and target are space separated. An example on a server with domain.tld as its domain:</p>
<div class="highlight"><pre><span></span><code><span class="c1"># Alias delivered to an existing account</span>
<span class="na">alias1@domain.tld user1@domain.tld</span>
<span class="c1"># Alias forwarded to an external email address</span>
<span class="na">alias2@domain.tld external@gmail.com</span>
</code></pre></div>
<h2 id="configuring-regexp-aliases"><a class="toclink" href="#configuring-regexp-aliases">Configuring RegExp Aliases</a></h2>
<p>Additional regexp aliases can be configured by placing them into <code>config/postfix-regexp.cf</code>. The regexp aliases get evaluated after the virtual aliases (<code>/tmp/docker-mailserver/postfix-virtual.cf</code>). For example, the following <code>config/postfix-regexp.cf</code> causes all email to "test" users to be delivered to <code>qa@example.com</code>:</p>
<div class="highlight"><pre><span></span><code><span class="na">/^test[0-9][0-9]*@example.com/ qa@example.com</span>
</code></pre></div>
<h2 id="address-tags-extension-delimiters-an-alternative-to-aliases"><a class="toclink" href="#address-tags-extension-delimiters-an-alternative-to-aliases">Address Tags (Extension Delimiters) an Alternative to Aliases</a></h2>
<p>Postfix supports so-called address tags, in the form of plus (+) tags - i.e. <a href="&#109;&#97;&#105;&#108;&#116;&#111;&#58;&#97;&#100;&#100;&#114;&#101;&#115;&#115;&#43;&#116;&#97;&#103;&#64;&#101;&#120;&#97;&#109;&#112;&#108;&#101;&#46;&#99;&#111;&#109;">&#97;&#100;&#100;&#114;&#101;&#115;&#115;&#43;&#116;&#97;&#103;&#64;&#101;&#120;&#97;&#109;&#112;&#108;&#101;&#46;&#99;&#111;&#109;</a> will end up at <a href="&#109;&#97;&#105;&#108;&#116;&#111;&#58;&#97;&#100;&#100;&#114;&#101;&#115;&#115;&#64;&#101;&#120;&#97;&#109;&#112;&#108;&#101;&#46;&#99;&#111;&#109;">&#97;&#100;&#100;&#114;&#101;&#115;&#115;&#64;&#101;&#120;&#97;&#109;&#112;&#108;&#101;&#46;&#99;&#111;&#109;</a>. This is configured by default and the (configurable !) separator is set to <code>+</code>. For more info, see <a href="https://www.stevejenkins.com/blog/2011/03/how-to-use-address-tagging-usertagexample-com-with-postfix/">How to use Address Tagging (<code>user+tag@example.com</code>) with Postfix</a> and the <a href="http://www.postfix.org/postconf.5.html#recipient_delimiter">official documentation</a>.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>If you do decide to change the configurable separator, you must add the same line to <em>both</em> <code>config/postfix-main.cf</code> and <code>config/dovecot.cf</code>, because Dovecot is acting as the delivery agent. For example, to switch to <code>-</code>, add:</p>
</div>
<div class="highlight"><pre><span></span><code><span class="na">recipient_delimiter</span> <span class="o">=</span> <span class="s">-</span>
</code></pre></div>
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