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# 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.

Cyrus IMAP 2.4 Releases