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<a href="https://github.com/docker-mailserver/docker-mailserver/edit/master/docs/content/examples/use-cases/imap-folders.md" title="Edit this page" class="md-content__button md-icon">
<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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<h1 id="mailboxes-aka-imap-folders"><a class="toclink" href="#mailboxes-aka-imap-folders">Mailboxes (<em>aka IMAP Folders</em>)</a></h1>
<p><code>INBOX</code> is setup as the private <a href="https://doc.dovecot.org/configuration_manual/namespace/#namespace-inbox"><code>inbox</code> namespace</a>. By default <a href="https://github.com/docker-mailserver/docker-mailserver/blob/master/target/dovecot/15-mailboxes.conf"><code>target/dovecot/15-mailboxes.conf</code></a> configures the special IMAP folders <code>Drafts</code>, <code>Sent</code>, <code>Junk</code> and <code>Trash</code> to be automatically created and subscribed. They are all assigned to the private <a href="https://doc.dovecot.org/configuration_manual/namespace/#namespace-inbox"><code>inbox</code> namespace</a> (<em>which implicitly provides the <code>INBOX</code> folder</em>).</p>
<p>These IMAP folders are considered special because they add a <a href="https://datatracker.ietf.org/doc/html/rfc6154"><em>"SPECIAL-USE"</em> attribute</a>, which is a standardized way to communicate to mail clients that the folder serves a purpose like storing spam/junk mail (<code>\Junk</code>) or deleted mail (<code>\Trash</code>). This differentiates them from regular mail folders that you may use for organizing.</p>
<h2 id="adding-a-mailbox-folder"><a class="toclink" href="#adding-a-mailbox-folder">Adding a mailbox folder</a></h2>
<p>See <a href="https://github.com/docker-mailserver/docker-mailserver/blob/master/target/dovecot/15-mailboxes.conf"><code>target/dovecot/15-mailboxes.conf</code></a> for existing mailbox folders which you can modify or uncomment to enable some other common mailboxes. For more information try the <a href="https://doc.dovecot.org/configuration_manual/namespace/#mailbox-settings">official Dovecot documentation</a>.</p>
<p>The <code>Archive</code> special IMAP folder may be useful to enable. To do so, make a copy of <a href="https://github.com/docker-mailserver/docker-mailserver/blob/master/target/dovecot/15-mailboxes.conf"><code>target/dovecot/15-mailboxes.conf</code></a> and uncomment the <code>Archive</code> mailbox definition. Mail clients should understand that this folder is intended for archiving mail due to the <a href="https://datatracker.ietf.org/doc/html/rfc6154"><code>\Archive</code> <em>"SPECIAL-USE"</em> attribute</a>.</p>
<p>With the provided <a href="https://github.com/docker-mailserver/docker-mailserver/blob/master/docker-compose.yml">docker-compose.yml</a> example, a volume bind mounts the host directory <code>docker-data/dms/config/</code> to the container location <code>/tmp/docker-mailserver/</code>. Config file overrides should instead be mounted to a different location as described in <a href="../../../config/advanced/override-defaults/dovecot/#override-configuration">Overriding Configuration for Dovecot</a>:</p>
<div class="highlight"><pre><span></span><code><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/config/dovecot/15-mailboxes.conf:/etc/dovecot/conf.d/15-mailboxes.conf:ro</span><span class="w"></span>
</code></pre></div>
<h2 id="caution"><a class="toclink" href="#caution">Caution</a></h2>
<h3 id="adding-folders-to-an-existing-setup"><a class="toclink" href="#adding-folders-to-an-existing-setup">Adding folders to an existing setup</a></h3>
<p>Handling of newly added mailbox folders can be inconsistent across mail clients:</p>
<ul>
<li>Users may experience issues such as archived emails only being available locally.</li>
<li>Users may need to migrate emails manually between two folders.</li>
</ul>
<h3 id="support-for-special-use-attributes"><a class="toclink" href="#support-for-special-use-attributes">Support for <code>SPECIAL-USE</code> attributes</a></h3>
<p>Not all mail clients support the <code>SPECIAL-USE</code> attribute for mailboxes (<em>defined in <a href="https://datatracker.ietf.org/doc/html/rfc6154">RFC 6154</a></em>). These clients will treat the mailbox folder as any other, using the name assigned to it instead.</p>
<p>Some clients may still know to treat these folders for their intended purpose if the mailbox name matches the common names that the <code>SPECIAL-USE</code> attributes represent (<em>eg <code>Sent</code> as the mailbox name for <code>\Sent</code></em>).</p>
<h3 id="internationalization-i18n"><a class="toclink" href="#internationalization-i18n">Internationalization (i18n)</a></h3>
<p>Usually the mail client will know via context such as the <code>SPECIAL-USE</code> attribute or common English mailbox names, to provide a localized label for the users preferred language.</p>
<p>Take care to test localized names work well as well.</p>
<h3 id="email-clients-support"><a class="toclink" href="#email-clients-support">Email Clients Support</a></h3>
<ul>
<li>If a new mail account is added without the <code>SPECIAL-USE</code> attribute enabled for archives:<ul>
<li><strong>Thunderbird</strong> suggests and may create an <code>Archives</code> folder on the server.</li>
<li><strong>Outlook for Android</strong> archives to a local folder.</li>
<li><strong>Spark for Android</strong> archives to server folder named <code>Archive</code>.</li>
</ul>
</li>
<li>If a new mail account is added after the <code>SPECIAL-USE</code> attribute is enabled for archives:<ul>
<li><strong>Thunderbird</strong>, <strong>Outlook for Android</strong> and <strong>Spark for Android</strong> will use the mailbox folder name assigned.</li>
</ul>
</li>
</ul>
<div class="admonition caution">
<p class="admonition-title">Windows Mail</p>
<p><strong>Windows Mail</strong> has been said to ignore <code>SPECIAL-USE</code> attribute and look only at the mailbox folder name assigned.</p>
</div>
<div class="admonition note">
<p class="admonition-title">Needs citation</p>
<p>This information is provided by the community.</p>
<p>It presently lacks references to confirm the behaviour. If any information is incorrect please let us know! <img alt="😄" class="twemoji" src="https://twemoji.maxcdn.com/v/latest/svg/1f604.svg" title=":smile:" /></p>
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