Cyrus IMAP 2.3.11 Release Notes
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Changes to the Cyrus IMAP Server since 2.3.10

* Fixed several skiplist bugs -- courtesy of Fastmail.fm.

* Add robustness to skiplist recovery -- courtesy of Fastmail.fm.

* Added support for modification sequences to replication protocol
  (for CONDSTORE) -- courtesy of David Carter.

* Fixed delayed delete replication -- courtesy of Fastmail.fm.

* Allow [un]deleting of user INBOXes (renaming to/from deleted
  hierarchy) to work when using delayed delete -- courtesy of Simon
  Matter.

* Fixed interaction with removal of rights and implicitownerrights.

* Fixed parsing of single FETCH item when using FETCH modifiers.

* Prevented SSL_accept() from blocking indefinitely when using
  TLS/SSL. This should eliminate a lot of hung SSL-wrapped processes.

* Allow STARTTLS to be used to externally preauth'd LMTP connections.

* Allow a TLS client certificate to be sufficient authentication for
  LMTP.

* timsieved now automatically sends CAPABILITY response after
  STARTTLS. This code was reintroduced after being mistakenly removed
  as part of bug #1338.

* Fixed miscellaneous bugs and build issues.

Cyrus IMAP 2.3 Releases