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    As far as I can tell, the last specification for thread=refs was
    here:<a
      href="https://tools.ietf.org/html/draft-ietf-morg-inthread-01"><a class="moz-txt-link-freetext" href="https://tools.ietf.org/html/draft-ietf-morg-inthread-01">https://tools.ietf.org/html/draft-ietf-morg-inthread-01</a></a><br>
    <br>
    To implement this you want to look at index.c in the Cyrus source
    and add another entry to the thread_algs[] array.  I'm guessing that
    you can reuse a lot of the existing index_thread_ref() code (which
    is probably needs to be renamed to index_thread_references()).<br>
    <br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 10/05/2015 06:07 AM, Gabriele Bulfon
      wrote:<br>
    </div>
    <blockquote
      cite="mid:18262603.71.1444039631264.JavaMail.sonicle@www"
      type="cite">
      <div style="font-family: Verdana; font-size: 12;">
        <div id="wt-mailcard">Great, Ken. Can you give me some advice /
          pointer to the sources I should look at?</div>
        <div id="wt-mailcard"><br>
        </div>
        <div id="wt-mailcard">Gabriele</div>
        <br>
        <hr><br>
        <br>
        <font size="2" face="Arial, Helvetica, sans-serif"><b>Da:</b>
          Ken Murchison <a class="moz-txt-link-rfc2396E" href="mailto:murch@andrew.cmu.edu">&lt;murch@andrew.cmu.edu&gt;</a><br>
          <b>A:</b> <a class="moz-txt-link-abbreviated" href="mailto:info-cyrus@lists.andrew.cmu.edu">info-cyrus@lists.andrew.cmu.edu</a> <br>
          <b>Data:</b> 2 ottobre 2015 19.08.04 CEST<br>
          <b>Oggetto:</b> Re: thread=refs<br>
        </font><br>
        <br>
        <blockquote style="BORDER-LEFT: #000080 2px solid; MARGIN-LEFT:
          5px; PADDING-LEFT: 5px">
          <div class="moz-cite-prefix">On 10/02/2015 10:53 AM, Gabriele
            Bulfon wrote:<br>
          </div>
          <blockquote
            cite="mid:11844453.9.1443797615639.JavaMail.sonicle@www"
            type="cite">
            <div style="font-family: Verdana; font-size: 12;">
              <div id="wt-mailcard">Nice, it's not a big deal for us to
                upgrade to new versions, surely easier than porting to
                Dovecot! ;)<br>
                <br>
                So, maybe we can help with the implementation.</div>
              <div id="wt-mailcard">In my mind, it's almost about
                changing the "thread=reference" and let it omit the
                subject matching, change sorting</div>
              <div id="wt-mailcard">and...maybe just this? How much hard
                do you think it is?</div>
              <br>
            </div>
          </blockquote>
          <br>
          That sounds about right from what I remember of
          THREAD=REFERENCES (which I co-authored and implemented) and
          THREAD=REFS (which I think was last documented in 2010).<br>
          <br>
          <br>
          <br>
          <blockquote
            cite="mid:11844453.9.1443797615639.JavaMail.sonicle@www"
            type="cite">
            <div style="font-family: Verdana; font-size: 12;">
              <hr><br>
              <br>
              <font size="2" face="Arial, Helvetica, sans-serif"><b>Da:</b>
                Bron Gondwana <a moz-do-not-send="true"
                  class="moz-txt-link-rfc2396E"
                  href="mailto:brong@fastmail.fm">&lt;brong@fastmail.fm&gt;</a><br>
                <b>A:</b> <a moz-do-not-send="true"
                  class="moz-txt-link-abbreviated"
                  href="mailto:info-cyrus@lists.andrew.cmu.edu">info-cyrus@lists.andrew.cmu.edu</a>
                <br>
                <b>Data:</b> 2 ottobre 2015 12.59.08 CEST<br>
                <b>Oggetto:</b> Re: thread=refs<br>
              </font><br>
              <br>
              <blockquote style="BORDER-LEFT: #000080 2px solid;
                MARGIN-LEFT: 5px; PADDING-LEFT: 5px">
                <div>No, there isn't. The conversations work in 3.0 beta
                  contains a lot of what would be required to
                  efficiently implement THREAD=REFS, but nobody has done
                  the work to implement it.<br>
                </div>
                <div> </div>
                <div>It certainly will never be backported to the 2.4
                  series, which is only getting security updates and
                  fixes for major bugs now.<br>
                </div>
                <div> </div>
                <div>Regards,<br>
                </div>
                <div> </div>
                <div>Bron.<br>
                </div>
                <div> </div>
                <div> </div>
                <div>On Fri, Oct 2, 2015, at 18:40, Gabriele Bulfon
                  wrote:<br>
                </div>
                <blockquote type="cite">
                  <div>Hi,<br>
                  </div>
                  <div> </div>
                  <div>we have systems running cyrus 2.4.12, where
                    thread algorithms are only references and
                    orderedsubject.<br>
                  </div>
                  <div>Is there support for the thread=refs algorithm?<br>
                  </div>
                  <div> </div>
                  <div>Thanks<br>
                  </div>
                  <div>Gabriele<br>
                  </div>
                  <div>----<br>
                  </div>
                  <div>Cyrus Home Page: <a moz-do-not-send="true"
                      href="http://www.cyrusimap.org/">http://www.cyrusimap.org/</a><br>
                  </div>
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                </blockquote>
                <div> </div>
                <div id="sig567075">
                  <div class="signature">--<br>
                  </div>
                  <div class="signature"> Bron Gondwana<br>
                  </div>
                  <div class="signature"> <a moz-do-not-send="true"
                      class="moz-txt-link-abbreviated"
                      href="mailto:brong@fastmail.fm">brong@fastmail.fm</a><br>
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                <div> </div>
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          <br>
          <br>
          <pre class="moz-signature" cols="72">-- 
Kenneth Murchison
Principal Systems Software Engineer
Carnegie Mellon University
</pre>
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    <br>
    <pre class="moz-signature" cols="72">-- 
Kenneth Murchison
Principal Systems Software Engineer
Carnegie Mellon University
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