Cyrus IMAP 2.3.16 Release Notes
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Changes to the Cyrus IMAP Server since 2.3.15

* Added user_deny.db to be able to selectively deny users access to
  Cyrus services.

* Added disconnect_on_vanished_mailbox option. See imapd.conf(5) for
  details

* Reworked SQL detection code in configure. See install-upgrade.html
  for more details.

* Added popuseimapflags option which enables setting and obeying IMAP
  flags in the POP server.

* Added optimized method of handling an empty maildrop in pop3d.
  Requires statuscache to be enabled. (based on work of Cyril Servant
  <elfejoyeux@gmail.com>)

* Added annotation_definitions option for specifying external (third-
  party) annotations. (courtesy of Thomas Viehmann <tv@beamnet.de>)

* Added sync_compress option to compress replication traffic

* Added user_folder_limit option to limit the number of folders a non-
  admin user is allowed to create.

* Added -x option to cyr_expire to disable expunge

* Track idle state so a shutdown doesn't leave idled killing random
  other processes on a busy system

* Fix missing closedir() - bug #3159 (thanks Simon Matter)

* Make Cyrus compile with older GCC (thanks Simon Matter)

Cyrus IMAP 2.3 Releases