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<section id="delayed-expunge">
<span id="imap-features-delayed-expunge"></span><h1>Delayed Expunge<a class="headerlink" href="#delayed-expunge" title="Permalink to this heading"></a></h1>
<p>When a user or IMAP client expunges a message or an entire folder,
messages become unavailable to the user.</p>
<p>When the deletion is accidental, administrators may have to recover the
messages from some place. When the messages are purposefully deleted,
the user may have done so not with the best of intentions.</p>
<p>In any case, the time between a message arriving and being deleted may
not be sufficient to ensure the message is replicated, included in the
next backup cycle, and generally available for recovery or compliance
with the regulatory environment.</p>
<p>Cyrus IMAP introduces <em>delayed expunge</em>, which ensures message files are
not immediately unlinked from the filesystem, and instead makes purging
the message files from the filesystem a separate event.</p>
<p>This enables administrators to quickly recover access to messages that
have been accidentally deleted, as well as allows the environment to
ensure messages remain available for inclusion in the next backup cycle.</p>
<section id="configuring-cyrus-imap-for-delayed-expunge">
<h2>Configuring Cyrus IMAP for Delayed Expunge<a class="headerlink" href="#configuring-cyrus-imap-for-delayed-expunge" title="Permalink to this heading"></a></h2>
<p>To enable or disable Delayed Expunge, please check the following
settings in <a class="reference internal" href="../../reference/manpages/configs/imapd.conf.html#std-cyrusman-imapd.conf-5">imapd.conf(5)</a>.</p>
<blockquote>
<div><blockquote>
<div><p><code class="docutils literal notranslate"><span class="pre">expunge_mode:</span></code> delayed</p>
<blockquote>
<div><p>The mode in which messages (and their corresponding cache entries)
are expunged. "semidelayed" mode is the old behavior in which the
message files are purged at the time of the EXPUNGE, but index
and cache records are retained to facilitate QRESYNC.
In "delayed" mode, which is the default since Cyrus 2.5.0,
the message files are also retained, allowing unexpunge to
rescue them. In "immediate" mode, both the message files and the
index records are removed as soon as possible. In all cases,
nothing will be finally purged until all other processes have
closed the mailbox to ensure they never see data disappear under
them. In "semidelayed" or "delayed" mode, a later run of "cyr_expire"
will clean out the retained records (and possibly message files).
This reduces the amount of I/O that takes place at the time of
EXPUNGE and should result in greater responsiveness for the client,
especially when expunging a large number of messages.
Allowed values: <em>immediate</em>, <em>semidelayed</em>, <em>delayed</em></p>
</div></blockquote>
</div></blockquote>
</div></blockquote>
<div class="admonition seealso">
<p class="admonition-title">See also</p>
<ul class="simple">
<li><p><a class="reference internal" href="../../reference/manpages/systemcommands/unexpunge.html#imap-reference-manpages-systemcommands-unexpunge"><span class="std std-ref">unexpunge</span></a></p></li>
<li><p><a class="reference internal" href="delayed-delete.html#imap-features-delayed-delete"><span class="std std-ref">Delayed Delete</span></a></p></li>
<li><p><a class="reference internal" href="../../reference/faqs/o-deleted-expired-expunged-purged.html#imap-admin-deleted-expired-expunged-purged"><span class="std std-ref">When is What ... Deleted, Expired, Expunged or Purged?</span></a></p></li>
</ul>
</div>
<p>Back to <a class="reference internal" href="../features.html#imap-features"><span class="std std-ref">Features</span></a></p>
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