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    <font size="+1"><tt>Suddenly I am getting undefined symbol errors
        having updated to 2.3.7. <br>
        <br>
        Jul 18 01:02:49 localhost dovecot: indexer-worker: Error: User
        <someone> lookup failed: Couldn't load required plugin
        /usr/lib/dovecot/modules/lib95_imap_sieve_plugin.so: dlopen()
        failed: /usr/lib/dovecot/modules/lib95_imap_sieve_plugin.so:
        undefined symbol: command_hook_register<br>
        <br>
        (I think I fixed this one by a config change)<br>
        <br>
        But I am left with this:<br>
        <br>
        Jul 19 14:09:52 localhost dovecot: indexer-worker: Error: User
        <someone> lookup failed: Couldn't load required plugin
        /usr/lib/dovecot/modules/lib90_sieve_plugin.so: dlopen() faile:
        /usr/lib/dovecot/modules/lib90_sieve_plugin.so: undefined
        symbol: mail_deliver_ctx_get_log_var_expand_table<br>
        <br>
        My (redacted) dovecot -n:<br>
        <br>
      </tt></font><font size="+1"><tt># 2.3.7 (494d20bdc):
        /etc/dovecot/dovecot.conf<br>
        # Pigeonhole version 0.5.7 (5a4e63b5)<br>
        # OS: Linux 4.15.0-54-generic x86_64 Ubuntu 18.04.2 LTS <br>
        # Hostname: localhost<br>
        auth_verbose = yes<br>
        first_valid_uid = 2000<br>
        imapc_features = rfc822.size fetch-headers<br>
        imapc_host = mailman.tobit.co.uk<br>
        imapc_port = 993<br>
        imapc_ssl = imaps<br>
        imapc_ssl_verify = no<br>
        imapc_user = %n<br>
        lda_mailbox_autocreate = yes<br>
        mail_attachment_dir = %h/attachments<br>
        mail_attachment_min_size = 64 k<br>
        mail_location = mdbox:%h:INBOX=%h/mail<br>
        mail_plugins = mail_log notify replication fts fts_lucene sieve<br>
        mail_prefetch_count = 20<br>
        managesieve_notify_capability = mailto<br>
        managesieve_sieve_capability = fileinto reject envelope
        encoded-character vacation subaddress comparator-i;ascii-numeric
        relational regex imap4flags copy include variables body enotify
        environment mailbox date index ihave duplicate mime foreverypart
        extracttext imapsieve vnd.dovecot.imapsieve<br>
        namespace inbox {<br>
          inbox = yes<br>
          location = <br>
          mailbox Drafts {<br>
            special_use = \Drafts<br>
          }<br>
          mailbox Junk {<br>
            special_use = \Junk<br>
          }<br>
          mailbox Sent {<br>
            special_use = \Sent<br>
          }<br>
          mailbox "Sent Messages" {<br>
            special_use = \Sent<br>
          }<br>
          mailbox Trash {<br>
            special_use = \Trash<br>
          }<br>
          prefix = <br>
        }<br>
        passdb {<br>
          args = # hidden <br>
          driver = sql<br>
        }<br>
        plugin {<br>
          fts = lucene<br>
          fts_autoindex = yes<br>
          fts_autoindex_exclude = \Junk<br>
          fts_autoindex_exclude2 = \Trash<br>
          fts_autoindex_exclude3 = \Deleted<br>
          fts_lucene = whitespace_chars=@.<br>
          imapsieve_mailbox1_before =
        <a class="moz-txt-link-freetext" href="file:/etc/dovecot/sieve/report-spam.sieve">file:/etc/dovecot/sieve/report-spam.sieve</a><br>
          imapsieve_mailbox1_causes = COPY<br>
          imapsieve_mailbox1_name = Junk<br>
          imapsieve_mailbox2_before =
        <a class="moz-txt-link-freetext" href="file:/etc/dovecot/sieve/report-ham.sieve">file:/etc/dovecot/sieve/report-ham.sieve</a><br>
          imapsieve_mailbox2_causes = COPY<br>
          imapsieve_mailbox2_from = Junk<br>
          imapsieve_mailbox2_name = *<br>
          mail_log_events = delete undelete expunge copy save
        mailbox_delete mailbox_rename mailbox_create<br>
          mail_log_fields = uid box msgid size<br>
          sieve = <a class="moz-txt-link-freetext" href="file:~/sieve;active=~/.dovecot.sieve">file:~/sieve;active=~/.dovecot.sieve</a><br>
          sieve_global_extensions = +vnd.dovecot.pipe
        +vnd.dovecot.environment<br>
          sieve_pipe_bin_dir = /etc/dovecot/sieve<br>
          sieve_plugins = sieve_imapsieve sieve_extprograms<br>
          sieve_trace_dir = /tmp<br>
          sieve_trace_level = matching<br>
        }<br>
        postmaster_address = <a class="moz-txt-link-abbreviated" href="mailto:postmaster@tobit.co.uk">postmaster@tobit.co.uk</a><br>
        protocols = imap lmtp sieve<br>
        service auth {<br>
          unix_listener exim-auth {<br>
            group = Debian-exim<br>
            mode = 0660<br>
            user = Debian-exim<br>
          }<br>
        }<br>
        service imap-login {<br>
          inet_listener imap {<br>
            port = 143<br>
          }<br>
          inet_listener imaps {<br>
            port = 993<br>
            ssl = yes<br>
          }<br>
        }<br>
        service lmtp {<br>
          inet_listener lmtp {<br>
            address = 127.0.0.1<br>
            port = # hidden<br>
          }<br>
          unix_listener lmtp {<br>
            mode = 0666<br>
          }<br>
          user = vmail<br>
        }<br>
        service managesieve-login {<br>
          inet_listener sieve {<br>
            port = # hidden <br>
          }<br>
          process_min_avail = 0<br>
          service_count = 1<br>
          vsz_limit = 64 M<br>
        }<br>
        service managesieve {<br>
          process_limit = 100<br>
        }<br>
        ssl_cert = # hidden<br>
        ssl_client_ca_dir = /etc/ssl/certs<br>
        ssl_dh = # hidden, use -P to show it<br>
        ssl_key = # hidden, use -P to show it<br>
        userdb {<br>
          args = # hidden<br>
          driver = sql<br>
        }<br>
        protocol imap {<br>
          mail_plugins = mail_log notify replication fts fts_lucene
        imap_sieve<br>
        }<br>
        protocol lmtp {<br>
          mail_plugins = fts fts_lucene sieve<br>
        }<br>
      </tt></font><font size="+1"><tt><br>
      </tt></font>
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