It has a number of new features and performance improvements including
much-expanded header caching and support for the IMAP SASL-IR and BINARY
extensions. This release also has a large number of bugfixes in the
Cyrus Murder support of virtdomain/altnamespace/unixhierachysep, as well
as a significant improvement in how Cyrus Master tracks processes.
Full changes are available in doc/changes.html in the distribution, sites
that are upgrading to this version will also want to read
doc/install-upgrade.html.
The new features include Virtual Domain support, NNTP
server support, IPv6 support, Compiled Sieve scripts, an improved
configuration subsystem, and many more visible and invisible changes.
IMAP (Internet Message Access Protocol) is an Internet standards-track
protocol for accessing messages (mail, bboards, news, etc). The Cyrus
IMAP server differs from other IMAP server implementations in that it
is generally intended to be run on "sealed" servers, where normal users
are not permitted to log in. The mailbox database is stored in parts of
the filesystem that are private to the Cyrus IMAP system. All user
access to mail is through the IMAP, POP3, or KPOP protocols.
