- update to 2.3.7.1 and pigeonhole to 0.5.7.1
  Dovecot 2.3.7.1
    - Fix TCP_NODELAY errors being logged on non-Linux OSes
    - lmtp proxy: Fix assert-crash when client uses BODY=8BITMIME
    - Remove wrongly added checks in namespace prefix checking
  Pigeonhole 0.5.7.1
    - dsync: Sieve script syncing failed if mailbox attributes weren't enabled.
  Dovecot 2.3.7
    * fts-solr: Removed break-imap-search parameter
    + Added more events for the new statistics, see
      https://doc.dovecot.org/admin_manual/list_of_events/
    + mail-lua: Add IMAP metadata accessors, see
      https://doc.dovecot.org/admin_manual/lua/
    + Add event exporters that allow exporting raw events to log files and
      external systems, see
      https://doc.dovecot.org/configuration_manual/event_export/
    + SNIPPET is now PREVIEW and size has been increased to 200 characters.
    + Add body option to fts_enforced. This triggers building FTS index only
      on body search, and an error using FTS index fails the search rather
      than reads through all the mails.
    - Submission/LMTP: Fixed crash when domain argument is invalid in a
      second EHLO/LHLO command.
    - Copying/moving mails using Maildir format loses IMAP keywords in the
      destination if the mail also has no system flags.
    - mail_attachment_detection_options=add-flags-on-save caused email body
      to be unnecessarily opened when FETCHing mail headers that were
      already cached.
    - mail attachment detection keywords not saved with maildir.
    - dovecot.index.cache may have grown excessively large in some
      situations. This happened especially when using autoexpunging with
      lazy_expunge folders. Also with mdbox format in general the cache file
      wasn't recreated as often as it should have.
    - Autoexpunged mails weren't immediately deleted from the disk. Instead,
      the deletion from disk happened the next time the folder was opened.
      This could have caused unnecessary delays if the opening was done by
      an interactive IMAP session.
    - Dovecot's TCP connections sometimes add extra 40ms latency due to not
      enabling TCP_NODELAY. HTTP and SMTP/LMTP connections weren't
      affected, but everything else was. This delay wasn't always visible -
      only in some situations with some message/packet sizes.
    - imapc: Fix various crash conditions
    - Dovecot builds were not always reproducible.
    - login-proxy: With shutdown_clients=no after config reload the
      existing connections could no longer be listed or kicked with doveadm.
    - "doveadm proxy kick" with -f parameter caused a crash in some
      situations.
    - Auth policy can cause segmentation fault crash during auth process
      shutdown if all auth requests have not been finished.
    - Fix various minor bugs leading into incorrect behaviour in mailbox
      list index handling. These rarely caused noticeable problems.
    - LDAP auth: Iteration accesses freed memory, possibly crashing
      auth-worker
    - local_name { .. } filter in dovecot.conf does not correctly support
      multiple names and wildcards were matched incorrectly.
    - replicator: dsync assert-crashes if it can't connect to remote TCP
      server.
    - config: Memory leak in config process when ssl_dh setting wasn't
      set and there was no ssl-parameters.dat file.
      This caused config process to die once in a while
      with "out of memory".
- bsc#1134242 - upgrade from 42.3 to 15.1: dovecot shows Unknown
  protocol 'SSLv2'
  * remove !SSLv2 from existing ssl_protocols configuration
    during upgrade
 

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