Changes in 2.4.19:
* Complete backport of the new (2.5 and later) IMAP IDLE implementation
(thanks Thomas Jarosh). This fixes a bunch of bugs and race conditions
that were inherent to the older implementation
* New option "imapidletimeout" overrides "timeout" specifically for
connections in IDLE state
* OpenSSL 1.1.0 is now supported
* Fixed: imap ENABLED doesn't print * ENABLED when nothing new enabled
* Fixed: mailbox lock management over rename (thanks Thomas Jarosh)
* Fixed: added overflow protection to urlfetch range checks
* Fixed: lmtpd can now deliver when mupdate server isn't available
(thanks Michael Menge)
* Fixed task 227: service processes no longer divide by zero when
invoked with -T 0 argument (thanks Ian Batten and Jens Erat)
* Fixed task 229: ctl_cyrusdb now uses database paths from imapd.conf
(thanks Simon Matter)
* Fixed bug #3862: mailbox database changes now rolled back on mupdate
failure during rename (thanks Michael Menge)
* Fixed: XFER to 2.5 and later no longer downgrades index to oldest version
* Fixed: nonsensical "TEXT.MIME" section now handled as "HEADER"
* Fixed: added missing 'auditlog: ' prefix to backend connections
(thanks Wolfgang Breyha)
* Fixed: IMAP SEARCH crash on some platforms
* Fixed: memory leaks in IMAP SEARCH and IMAP APPEND
* Fixed Issue #1967: EXISTS count reported earlier if fetching past size
of previous message set
Changes in 2.4.20:
* Fixed: lmtpd crash
* Fixed: auth_pts will now error if its configured socket path is too
long for its buffer
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