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<section id="reconstructing-mailboxes">
<span id="id1"></span><h1>Reconstructing Mailboxes<a class="headerlink" href="#reconstructing-mailboxes" title="Permalink to this heading"></a></h1>
<section id="individual-mailboxes-or-folders">
<h2>Individual mailboxes or folders<a class="headerlink" href="#individual-mailboxes-or-folders" title="Permalink to this heading"></a></h2>
<p>If you have a mailbox within the filesystem but the folders and/or messages do not show up via IMAP or the cyradm utility, you may need to run <code class="docutils literal notranslate"><span class="pre">reconstruct</span></code> on the mailbox. This will rebuild the cyrus.* cache files and add any new folders to the internal cyrus mailbox list.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The <code class="docutils literal notranslate"><span class="pre">-k</span></code> switch preserves expunged messages so they can be undeleted if required. Without it, anything expunged will be permanently removed (Applies to Cyrus IMAP 2.3 and below.) On Cyrus IMAP 2.4.0 and above, this is not required as preserving the expunged messages is the only mode of operation.</p>
</div>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>cyrus $ /usr/lib/cyrus-imapd/reconstruct -k -r -f user/jdoe@example.com
discovered example.com!user.jdoe.Drafts
discovered example.com!user.jdoe.Trash
discovered example.com!user.jdoe.Sent
user/jdoe@example.com
user/jdoe/Sent@example.com
user/jdoe/Trash@example.com
user/jdoe/Drafts@example.com
</pre></div>
</div>
<p>The above output shows the 3 sub-folders Sent, Trash and Drafts were found in addition to the top level INBOX. Sub-folders are only detected by the presence of a cyrus.header file.</p>
<p>Once this has been done, the client will probably need to subscribe to the newly discovered folders.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>After restoring folders using reconstruct, you may need to recalculate the quota usage for the mailbox since this is not done by the reconstruct command.</p>
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</section>
<section id="recovering-a-complete-spool-directory">
<h2>Recovering a complete spool directory<a class="headerlink" href="#recovering-a-complete-spool-directory" title="Permalink to this heading"></a></h2>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>Use the -m switch with caution!</p>
</div>
<p>When invoked with the -m switch, <code class="docutils literal notranslate"><span class="pre">reconstruct</span></code> will rebuild the master mailboxes file. This can (in theory) be used to recover from almost any sort of data corruption.</p>
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