Cyrus IMAP 2.3.13 Release Notes
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Changes to the Cyrus IMAP Server since 2.3.12

* Added an experimental "sql" backend for cyrusdb. Currently MySQL,
  PostgreSQL, and SQLite are supported. See the new sql_* options for
  details.

* Added support for IMAP [CAPABILITY] response code to client-side of
  Murder proxies.

* Added support for ManageSieve auto-capability response after
  STARTTLS and after AUTH with a SASL security layer.

* Made MAXWORD and MAXQUOTED sizes configurable via imapd.conf --
  courtesy of Fastmail.fm.

* Rewrote cyrusdb_quotalegacy.c to use readir() rather than glob.c.
  This avoids a potential crash due to conflicts between glibc and
  Heimdal implementations of glob().

* Added support for fulldirhash to ctl_mboxlist -v.

* More skiplist transaction fixes -- courtesy of Fastmail.fm.

* cyr_expire no longer has a default of 0 (zero) for -X and -D. These
  options must be used explicitly in order to have the desired effect.

* Added sieve_utf8fileinto option.

* Added sieve_sasl_send_unsolicited_capability and
  sieve_sasl_expect_unsolicited_capability options.

* Several 32/64-bit compatibility fixes.

* Fixed miscellaneous bugs and build issues.

Cyrus IMAP 2.3 Releases