- update to 2.3.8 and pigeonhole to 0.5.8
  Dovecot 2.3.8
  + Added mail_delivery_started and mail_delivery_finished events, see
    https://doc.dovecot.org/admin_manual/list_of_events/ for details.
  + dsync-replication: Don't replicate users who have "noreplicate" extra
    field in userdb.
  + doveadm service status: Show total number of processes created.
  + When logging to syslog, use instance_name setting's value for the
    ident. This commonly is added as a log prefix.
  + Base64 encoding/decoding code was rewritten with additional features.
    It shouldn't cause any user visible changes.
  - v2.3.7 regression: If a folder only receives new mails without any
    other mail access, dovecot.index.log keeps growing forever and
    dovecot.index keeps being rewritten for every mail delivery.
  - dsync-replication may lose keywords after syncing mails restored from
    another replica. This only happened if the mail only had keywords and
    no system flags.
  - event filters: Non-textual event fields could not be filtered using
    wildcards.
  - auth: Scope parameter was missing from OAuth password grant
    request.
  - doveadm client-server communication may hang in some situations.
    It is also using unnecessarily small TCP/IP packet sizes.
  - doveadm who and kick did not flush protocol output correctly.
  - imap: SETMETADATA with literal value would delete the metadata value
    instead of updating it.
  - imap: When client issues FETCH PREVIEW (LAZY=FUZZY) command, the
    caching decisions should be updated so that newly saved mails will
    have the preview cached.
  - With mail_nfs_index=yes and/or mail_nfs_storage=yes setuid/setgid
    permission bits in some files may have become dropped with some NFS
    servers. Changed NFS flushing to now use chmod() instead of chown().
  - quota: warnings did not work if quota root was noenforcing
  - acl: Global ACL file ignored the last line if it didn't end with LF.
  - doveadm stats dump: With JSON formatter output numbers using the
    number type instead of as strings
  - lmtp_proxy: Ensure that real_* variables are correctly set when using
    lmtp_proxy.
  - event exporter: http-post driver had hardcoded timeout and did not
    support DNS lookups or TLS connections.
  - auth: Fix user iteration to work with userdb passwd with glibc v2.28.
  - auth: auth service can crash if auth-policy JSON response is invalid
    or returned too fast.
  - In some rare situations "ps" output could have shown a lot of "?"
    characters after Dovecot process titles.
  - When dovecot.index.pvt is empty, an unnecessary error is logged:
    Error: .../dovecot.index.pvt reset, view is now inconsistent
  - SMTP address encoder duplicated initial double quote character when
    the localpart of an address ended in '..'. For example
    "user+..@example.com" became ""user+.."@example.com in a
    sieve redirect.
  Pigeonhole 0.5.8
  - Sieve may leak resources in rare cases when a redirect, vacation or
    report action fails to send the message. This mainly applies when
    Sieve is executed in IMAP context; i.e., for the IMAPSIEVE or
    FILTER=SIEVE capabilities.

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