Log Message:
Changes 2.2.14:
* lmtp: Delivered-To: header no longer contains <> around the email
  address. Other MDAs don't have it either.
* "Out of disk space" errors are now treated as temporary errors
  (not the same as "Out of disk quota").
* replication plugin: Use replication only for users who have a
  non-empty mail_replica setting.

+ lmtp proxy: Log a line about each mail delivery.
+ Added login_source_ips setting. This can be used to set the source IP
  address round-robin from a pool of IPs (in case you run out of TCP
  ports).
+ Rawlog settings can use tcp:<host>:<port> as the path.
+ virtual plugin: Don't keep more than virtual_max_open_mailboxes
  (default 64) number of backend mailboxes open.
+ SSL/TLS compression can be disabled with ssl_options=no_compression
+ acl: Global ACL file now supports "quotes" around patterns.
+ Added last-login plugin to set user's last-login timestamp on login.
+ LDAP auth: Allow passdb credentials lookup also with auth_bind=yes
- IMAP: MODSEQ was sent in FETCH reply even if CONDSTORE/QRESYNC wasn't
  enabled. This broke at least old Outlooks.
- passdb static treated missing password field the same as an empty
  password field.
- mdbox: Fixed potential infinite looping when scanning a broken
  mdbox file.
- imap-login, pop3-login: Fixed potential crashes when client
  disconnected unexpectedly.
- imap proxy: The connection was hanging in some usage patterns. This
  mainly affected older Outlooks.
- lmtp proxy: The proxy sometimes delivered empty mails in error
  situations or potentially delivered truncated mails.
- fts-lucene: If whitespace_chars was set, we may have ended up
  indexing some garbage words, growing the index size unnecessarily.
- -c and -i parameters for dovecot/doveadm commands were ignored if
  the config socket was readable.
- quota: Quota recalculation didn't include INBOX in some setups.
- Mail headers were sometimes added to dovecot.index.cache in wrong
  order. The main problem this caused was with dsync+imapc incremental
  syncing when the second sync thought the local mailbox had changed.
- doveadm backup didn't notice if emails were missing from the middle
  of the destination mailbox. Now it deletes and resyncs the mailbox.