Cyrus IMAP 2.4.18 Release Notes
Security fix: handle urlfetch range starting outside message range
A bunch of cleanups and fixes to compiling
A bunch of sieve cleanups
Enhanced SSL/TLS configuration options
Disable use of SSLv2/SSLv3
Allow SQL backend for mboxlist and statuscache (thanks Julien Coloos)
Fixed task 116: correct LIST response for domains starting with 'inbox.'
Fixed task 76: fixed lmtpd userdeny db checks (thanks Leena Heino)
Fixed bug #3856: lmtpd now performs userdeny checks
Fixed bug #3848: support charset aliases in encoded headers
Fixed bug #3853: disconnect_on_vanished_mailbox: release mailbox lock before exiting (thanks Wolfgang Breyha)
Fixed bug #3415: fixed nntpd LIST/GROUP bug
Fixed bug #3784: no longer crash in THREAD REFERENCES when messages reference themselves
Fixed bug #3757: don't segfault on mailbox close with no user
New ssl/tls configuration options
tls_compression: 0
Enable TLS compression. Disabled by default.
tls_eccurve: prime256v1
Select the elliptic curve used for ECDHE.
tls_prefer_server_ciphers: 0
Prefer the cipher order configured on the server-side.
tls_versions: tls1_0 tls1_1 tls1_2
Disable SSL/TLS protocols not in this list.