Cyrus IMAP 2.3.10 Release Notes
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Changes to the Cyrus IMAP Server since 2.3.9

* Added support for “delayed” delete, in which mailboxes are renamed
  to a special admin-only “deleted” hierarchy at the time of the
  DELETE (hiding them from the client), rather than immediately
  removing them from the filesystem. This allows messages/mailboxes to
  be recovered by the admin in case of user error. The mailboxes and
  messages can be removed at a later time by cyr_expire. The new
  delete_mode and deletedprefix options in imapd.conf controls whether
  deletes are “immediate” or “delayed” and the mailbox hierarchy for
  “delayed” deletes. – courtesy of David Carter and FastMail.fm.

* Fixed the special case of RENAMEing an Inbox, so that it doesn’t
  keep the same mailbox uniqueid, thus allowing it to replicate
  properly (seen state is still preserved).

* Disabled Nagle’s algorithm in sync_client and sync_server to
  increase the throughput of the replication protocol. – courtesy of
  Wes Craig.

* Added support for a shared Seen flag on messages (must be enabled
  on a per-mailbox basis with the /vendor/cmu/cyrus-imapd/sharedseen
  mailbox annotation.

* Added -g and -G options to reconstruct – courtesy of David Carter.

* Added SETUIDVALIDITY command to the replication protocol –
  courtesy of David Carter.

* Finally fixed (again?) alignment issues on 64-bit SPARC.

* Changed message GUIDs used by replication to be the SHA1 hash of
  the messages – based on work of David Carter and Fastmail.fm.

* Improve the performance of commands that operate on sequence-sets.
  The sequence-set is now parsed only once, and the commands operate
  on a sorted list of seq-ranges.

* Added new cyr_synclog utility for adding events to the replication
  log – courtesy of Fastmail.fm.

* Added support for PCRE library – courtesy of Fastmail.fm.

* Added support for disabling duplicate delivery suppression on a
  per- folder basis with the /vendor/cmu/cyrus-imapd/duplicatedeliver
  mailbox annotation – courtesy of Fastmail.fm.

* Fixed miscellaneous bugs and build issues.

Cyrus IMAP 2.3 Releases
