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<section id="cyrus-imap-3-3-0-tag-notes">
<h1>Cyrus IMAP 3.3.0 Tag Notes<a class="headerlink" href="#cyrus-imap-3-3-0-tag-notes" title="Permalink to this heading"></a></h1>
<p>Unavailable for download as this is a development branch only.</p>
<p>Access is via git.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>This should be considered for
<strong>testing purposes</strong> and <strong>bleeding-edge features</strong> only. We will try to tag these
snapshots at coherent development points, but there will generally be <strong>large
breaking changes</strong> occurring between releases in this series.</p>
</div>
<section id="major-changes-since-the-3-2-series">
<span id="relnotes-3-3-0-changes"></span><h2>Major changes since the 3.2 series<a class="headerlink" href="#major-changes-since-the-3-2-series" title="Permalink to this heading"></a></h2>
<ul class="simple">
<li><p>DAV improvements</p></li>
<li><p>Improved performance for users with large folders</p></li>
<li><p>LITERAL- maximum size is now honoured (<span class="target" id="index-0"></span><a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc7888.html"><strong>RFC 7888</strong></a>)</p></li>
<li><p>Support for the ESORT (but not CONTEXT) extension from <span class="target" id="index-1"></span><a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc5267.html"><strong>RFC 5267</strong></a></p></li>
<li><p>Experimental <a class="reference external" href="https://tools.ietf.org/html/draft-murchison-jmap-sieve">JMAP for Sieve Scripts</a> support
(requires <cite>jmap_nonstandard_extensions: yes</cite> in <a class="reference internal" href="../../../../reference/manpages/configs/imapd.conf.html#std-cyrusman-imapd.conf-5">imapd.conf(5)</a>).</p></li>
<li><p>Experimental <a class="reference external" href="https://tools.ietf.org/html/draft-ietf-jmap-mdn">Handling Message Disposition Notification with JMAP</a> support
(requires <cite>jmap_nonstandard_extensions: yes</cite> in <a class="reference internal" href="../../../../reference/manpages/configs/imapd.conf.html#std-cyrusman-imapd.conf-5">imapd.conf(5)</a>).</p></li>
<li><p>Experimental JMAP Backup extension (requires
<cite>jmap_nonstandard_extensions: yes</cite> in <a class="reference internal" href="../../../../reference/manpages/configs/imapd.conf.html#std-cyrusman-imapd.conf-5">imapd.conf(5)</a>).</p></li>
<li><p>Experimental JMAP Notes extension (requires
<cite>jmap_nonstandard_extensions: yes</cite> in <a class="reference internal" href="../../../../reference/manpages/configs/imapd.conf.html#std-cyrusman-imapd.conf-5">imapd.conf(5)</a>).</p></li>
<li><p>Experimental JMAP Blob extension (requires
<cite>jmap_nonstandard_extensions: yes</cite> in <a class="reference internal" href="../../../../reference/manpages/configs/imapd.conf.html#std-cyrusman-imapd.conf-5">imapd.conf(5)</a>).</p></li>
<li><p>Experimental JMAP Mail extension (requires
<cite>jmap_nonstandard_extensions: yes</cite> in <a class="reference internal" href="../../../../reference/manpages/configs/imapd.conf.html#std-cyrusman-imapd.conf-5">imapd.conf(5)</a>).</p></li>
<li><p>New cyrus.index format v17 adds changes_epoch field, needed by JMAP Backups
extension</p></li>
<li><p>New <cite>reverseuniqueids</cite> <a class="reference internal" href="../../../../reference/manpages/configs/imapd.conf.html#std-cyrusman-imapd.conf-5">imapd.conf(5)</a> option (default on), which
improves performance for users with large mailboxes</p></li>
<li><p>Further improvements to the <cite>reverseacls</cite> <a class="reference internal" href="../../../../reference/manpages/configs/imapd.conf.html#std-cyrusman-imapd.conf-5">imapd.conf(5)</a> performance
option</p></li>
<li><p>Improvements to replication reliability and performance</p></li>
<li><p>Experimental vnd.cyrus.log, vnd.cyrus.jmapquery, and vnd.cyrus.snooze
Sieve extensions</p></li>
<li><p>Improvements to conversations</p></li>
<li><p>New <cite>mailbox_maxmessages_addressbook</cite>, <cite>mailbox_maxmessages_calendar</cite>, and
<cite>mailbox_maxmessages_email</cite> <a class="reference internal" href="../../../../reference/manpages/configs/imapd.conf.html#std-cyrusman-imapd.conf-5">imapd.conf(5)</a> options for providing
server-wide limits on the amount of objects in any one mailbox, independently
of quotas. These default to <cite>0</cite> (unlimited) for backward compatibility, but
are highly recommended for protecting your server from misbehaving clients.</p></li>
<li><p>New IMAP create/delete behaviour based on
<a class="reference external" href="https://tools.ietf.org/html/draft-ietf-extra-imap4rev2">draft-ietf-extra-imap4rev2</a>: mailboxes containing child mailboxes
can no longer be deleted; and when creating mailboxes, ancestors will be
created as needed.</p></li>
<li><p>CRC32 optimisations</p></li>
</ul>
</section>
<section id="updates-to-default-configuration">
<h2>Updates to default configuration<a class="headerlink" href="#updates-to-default-configuration" title="Permalink to this heading"></a></h2>
<p>The <a class="reference internal" href="../../../../reference/manpages/systemcommands/cyr_info.html#std-cyrusman-cyr_info-8">cyr_info(8)</a> <cite>conf</cite>, <cite>conf-all</cite> and <cite>conf-default</cite> subcommands
accept an <cite>-s <version></cite> argument to highlight <a class="reference internal" href="../../../../reference/manpages/configs/imapd.conf.html#std-cyrusman-imapd.conf-5">imapd.conf(5)</a>
options that are new or whose behaviour has changed since the specified
version. We recommend using this when evaluating a new Cyrus version to
check which configuration options you will need to examine and maybe set or
change during the process.</p>
<ul class="simple">
<li><p>None so far</p></li>
</ul>
</section>
<section id="security-fixes">
<h2>Security fixes<a class="headerlink" href="#security-fixes" title="Permalink to this heading"></a></h2>
<ul class="simple">
<li><p>None so far</p></li>
</ul>
</section>
<section id="significant-bugfixes">
<h2>Significant bugfixes<a class="headerlink" href="#significant-bugfixes" title="Permalink to this heading"></a></h2>
<ul class="simple">
<li><p>Fixed: Sieve Editheader Extension (<span class="target" id="index-2"></span><a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc5293.html"><strong>RFC 5293</strong></a>) now works correctly with
respect to section 7, Interaction with Other Sieve Extensions.</p></li>
</ul>
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