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    <p>Hi,</p>
    <p>with a Python script I have found that all users that have this
      errors are using Thunderbird:</p>
    <p># ./check.py /var/log/dovecot/dovecot.log<br>
      <p4YB0WKNUcNf8zAf> ==> name=Thunderbird, version=60.7.2<br>
      <kVE0RGKN/8Jf8zAf> ==> name=Thunderbird, version=60.7.2<br>
      <oFUykWONFctdPUnr> ==> name=Thunderbird, version=60.7.2<br>
      <dUyUlmONVMUCLHgk> ==> name=Thunderbird, version=60.7.2<br>
      <dfaphWONS8UCLHgk> ==> name=Thunderbird, version=60.7.2<br>
      <qV/6jWSN2s9PHpgH> ==> name=Thunderbird, version=60.8.0<br>
      <QLeWB0+NuvBTlali> ==> name=Thunderbird, version=60.7.2<br>
      <RQFSxE+NyXdQEudp> ==> name=Thunderbird, version=60.7.2<br>
      <MFXR2U+N17NQEudp> ==> name=Thunderbird, version=60.7.2<br>
      <8WsIY1CN5uoCLHgk> ==> name=Thunderbird, version=60.7.2<br>
      <x6uQxU+NgeMCLHgk> ==> name=Thunderbird, version=60.7.2<br>
      <4ezjaFCNfJVQEudp> ==> name=Thunderbird, version=60.7.2</p>
    <p>So seem a problem with only Thunderbird, but why? And can be
      mitigated by us?</p>
    <p>Thanks<br>
    </p>
    <div class="moz-cite-prefix">Il 11/07/19 09:13, Alessio Cecchi via
      dovecot ha scritto:<br>
    </div>
    <blockquote type="cite"
      cite="mid:852912e4-22b5-7034-334b-e955d088a853@skye.it">
      <meta http-equiv="content-type" content="text/html;
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      <p>Hi,</p>
      <p>I'm running some Dovecot servers configured with LVS + Director
        + Backend + NFS and version 2.2.36.3 (a7d78f5a2).<br>
      </p>
      <p>In the last days I see an increased number of these error:</p>
      <p>Error:
o_stream_send_istream(/nfs/mail/company.com/info/Maildir/.Sent/tmp/1562771349.M255624P9151.pop01)
        failed: Broken pipe</p>
      <p>always with action "Disconnected in APPEND", when users try to
        upload a message in Sent or Drafts.</p>
      <p>Here the logs:<br>
      </p>
      <p><br>
        Director:<br>
        Jul 10 14:53:06 imap-login: Info: proxy(<a
          class="moz-txt-link-abbreviated"
          href="mailto:info@company.com" moz-do-not-send="true">info@company.com</a>):
        started proxying to 10.0.0.20:143: user=<a
          class="moz-txt-link-rfc2396E" href="mailto:info@company.com"
          moz-do-not-send="true"><info@company.com></a>,
        method=PLAIN, rip=84.1.2.3, lip=195.1.2.3, lport=993, TLS,
        session=<eA6XKFONwP1f5Sh4><br>
        Jul 10 15:09:56 imap-login: Info: proxy(<a
          class="moz-txt-link-abbreviated"
          href="mailto:info@company.com" moz-do-not-send="true">info@company.com</a>):
        disconnecting 84.1.2.3 (Disconnected by client: EOF(0s idle,
        in=648413, out=6602)): user=<a class="moz-txt-link-rfc2396E"
          href="mailto:info@company.com" moz-do-not-send="true"><info@company.com></a>,
        method=PLAIN, rip=84.1.2.3, lip=195.1.2.3, lport=993, TLS,
        session=<eA6XKFONwP1f5Sh4><br>
        <br>
        Backend:<br>
        Jul 10 14:53:06 pop01 dovecot: imap-login: ID sent:
        x-session-id=eA6XKFONwP1f5Sh4, x-originating-ip=84.1.2.3,
        x-originating-port=64960, x-connected-ip=195.1.2.3,
        x-connected-port=993, x-proxy-ttl=4: user=<>,
        rip=84.1.2.3, lip=195.1.2.3, secured,
        session=<eA6XKFONwP1f5Sh4><br>
        Jul 10 14:53:06 pop01 dovecot: imap-login: Login: user=<a
          class="moz-txt-link-rfc2396E" href="mailto:info@company.com"
          moz-do-not-send="true"><info@company.com></a>,
        method=PLAIN, rip=84.1.2.3, lip=195.1.2.3, mpid=9151, secured,
        session=<eA6XKFONwP1f5Sh4><br>
        Jul 10 14:53:07 pop01 dovecot: imap(<a
          class="moz-txt-link-abbreviated"
          href="mailto:info@company.com" moz-do-not-send="true">info@company.com</a>)
        session=<eA6XKFONwP1f5Sh4>: ID sent: name=Thunderbird,
        version=60.7.2<br>
        Jul 10 15:09:56 pop01 dovecot: imap(<a
          class="moz-txt-link-abbreviated"
          href="mailto:info@company.com" moz-do-not-send="true">info@company.com</a>)
        session=<eA6XKFONwP1f5Sh4>: Error:
o_stream_send_istream(/nfs/mail/company.com/info/Maildir/.Sent/tmp/1562771349.M255624P9151.pop01)
        failed: Broken pipe<br>
        Jul 10 15:09:57 pop01 dovecot: imap(<a
          class="moz-txt-link-abbreviated"
          href="mailto:info@company.com" moz-do-not-send="true">info@company.com</a>)
        session=<eA6XKFONwP1f5Sh4>: Disconnected in APPEND (1
        msgs, 48 secs, 0/2657336 bytes) in=886661 out=26654 del=1 expu=0
        trash=0</p>
      <p>I can't understand if is a network problem (Firewall? Load
        Balancer? Switch?) or a users LAN problem. Or others.</p>
      <p>When this happen user see an error message like "Unable to save
        email in Sent folder".<br>
      </p>
      <p>Any suggestions?</p>
      <p>Thanks<br>
      </p>
      <pre class="moz-signature" cols="72">-- 
Alessio Cecchi
Postmaster @ <a class="moz-txt-link-freetext" href="http://www.qboxmail.it" moz-do-not-send="true">http://www.qboxmail.it</a>
<a class="moz-txt-link-freetext" href="https://www.linkedin.com/in/alessice" moz-do-not-send="true">https://www.linkedin.com/in/alessice</a></pre>
    </blockquote>
    <pre class="moz-signature" cols="72">-- 
Alessio Cecchi
Postmaster @ <a class="moz-txt-link-freetext" href="http://www.qboxmail.it">http://www.qboxmail.it</a>
<a class="moz-txt-link-freetext" href="https://www.linkedin.com/in/alessice">https://www.linkedin.com/in/alessice</a></pre>
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