Cyrus IMAP 2.4.0 Release Notes¶

Changes to the Cyrus IMAP Server since 2.3.x

All databases are now default skiplist, and ctl_cyrusdb will automatically convert database type on startup.
make_sha1 and make_md5 are removed (replaced by GUID and reconstruct changes)
Charset subsystem rewritten - Unicode 5.2 rather than Unicode 2, and UTF-8 support in sieve.
Core mailbox handling code largely rewritten with new APIs, CRC checksums, new locking mechanisms, merging of cyrus.index and cyrus.expunge, inclusion of user Seen flag, and much more.
Replication code largely rewritten to provide better performance, consistency checking, and recovery from “split-brain” scenarios.
Added support for LIST-EXTENDED IMAP extension. Removed support for deprecated (compile-time) LISTEXT IMAP extension. Based on work by Martin Konold <martin.konold@erfrakon.de>
Added support for ESEARCH IMAP extension.
Added support for WITHIN extension to IMAP SEARCH.
Added support for ENABLE IMAP extension.
Added support for QRESYNC IMAP extension.
Added support for URLAUTH=BINARY IMAP extension.
Removed legacy IMAP[2|3|4] cruft. We now only support IMAPrev1 + extensions.
Added support for marking QoS on traffic. (courtesy of Philip Prindeville <philipp@redfish-solutions.com>)
Modified user_deny.db code to open database once at service startup time.
… and hundreds of tiny things too numerous to mention in a short change log …