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    <font face="Courier New">got it - I see a lot of commits zstd
      related, after the release 2.3.11.3 - is it considered as stable ?
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    <div class="moz-cite-prefix">Am 28.08.2020 um 16:49 schrieb Timo
      Sirainen:<br>
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      cite="mid:F7EC93A1-0234-40F1-9353-063D730F754B@sirainen.com">
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      zstd support was added in v2.3.11 (not v2.3.12 like I mistakenly
      tried to say in the earlier mail).<br class="">
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          <div class="">On 28. Aug 2020, at 16.36, Robert Nowotny <<a
              href="mailto:rnowotny@rotek.at" class=""
              moz-do-not-send="true">rnowotny@rotek.at</a>> wrote:</div>
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            <div class=""> <br class="">
              ok, I did install zstd (zstd command line interface
              64-bits v1.4.4, by Yann Collet)<br class="">
              <br class="">
              reconfigured & compiled dovecot <font class=""
                face="Courier New"><font class="" face="Courier New"><font
                    class="" face="Courier New"><font class=""
                      face="Courier New">2.3.10.1  </font></font></font></font>again
              with option : with-zstd<br class="">
              <br class="">
              changed the configuration file to : <br class="">
              <br class="">
              <pre id="codecell0" style="overflow: auto hidden; font-family: Consolas, Menlo, "DejaVu Sans Mono", "Bitstream Vera Sans Mono", monospace; font-size: 0.9em; background: rgb(238, 238, 238); padding: 7px 30px; margin: 15px 0px; line-height: 1.3em; color: rgb(62, 67, 73); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;" class="">zlib_save = zstd</pre>
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              and restarted dovecot - <br class="">
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              now I have following log file errors : <br class="">
              <br class="">
              Aug 28 16:17:39 lxc-imap dovecot:
              imap(rnowotny)<237930><H1kft/CtENRUclcc>:
              Error: zlib_save: Unknown handler: zstd<br class="">
              Aug 28 16:17:44 lxc-imap dovecot:
              imap(rprager)<237939><p5hst/Ct8evAqKhu>:
              Error: zlib_save: Unknown handler: zstd<br class="">
              Aug 28 16:17:44 lxc-imap dovecot:
              imap(rprager)<237940><Vp5st/Ct8uvAqKhu>:
              Error: zlib_save: Unknown handler: zstd<br class="">
              Aug 28 16:17:44 lxc-imap dovecot:
              imap(rprager)<237941><U31tt/Ct8+vAqKhu>:
              Error: zlib_save: Unknown handler: zstd<br class="">
              ...<br class="">
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              what I do wrong here ? <br class="">
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              <div class="moz-cite-prefix">Am 28.08.2020 um 13:15
                schrieb Timo Sirainen:<br class="">
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                cite="mid:45761B39-9221-4892-823F-4E390F4C040B@sirainen.com"
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                On 28. Aug 2020, at 12.10, Robert Nowotny <<a
                  href="mailto:rnowotny@rotek.at" class=""
                  moz-do-not-send="true">rnowotny@rotek.at</a>>
                wrote:<br class="">
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                      <div class=""> <font class="" face="Courier New">unfortunately
                          after re-installing </font><font class=""
                          face="Courier New">2.3.11.3, those broken-pipe
                          errors appear again. (on different, new files)
                          <br class="">
                          so for sure there is something broken with
                          zlib.<br class="">
                          I will go back to</font><font class=""
                          face="Courier New"><font class=""
                            face="Courier New"> 2.3.10.1 now.<br
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                            attached is the configuration file, though
                            it did not change between </font></font><font
                          class="" face="Courier New"><font class=""
                            face="Courier New"><font class=""
                              face="Courier New"><font class=""
                                face="Courier New">2.3.10.1</font></font></font>
                        </font><font class="" face="Courier New">and </font><font
                          class="" face="Courier New"><font class=""
                            face="Courier New">2.3.11.3<br class="">
                          </font></font></div>
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                  <div class="">Oh, this is with xz, not with gz like we
                    first thought. There are some known problems with
                    xz, which is why we are planning on removing it
                    entirely. I'm not sure why v2.3.11 breaks it,
                    although there are some changes related to it but it
                    might be coincidence. I can't reproduce this problem
                    though.</div>
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                  <div class="">In any case, I'd recommend switching to
                    zlib or to zstd in v2.3.12. (In theory you could
                    leave the existing mails xz-compressed, but best
                    would be to re-compress everything via dsync so old
                    mails can be read when we eventually remove xz
                    support.)</div>
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