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The Cyrus wiki is a web-based collaboration area for the CyrusSasl and CyrusImapd software packages.
According to Wikipedia:Internet Message Access Protocol, the Cyrus IMAP server is one of the most widely used IMAP server implementations in the world.
The Cyrus wiki discusses the "Cyrus project", developing a highly scalable, high availability, high performance, Open source, standards-compliant implementation of IMAP email server that can be load distributed among a pool of servers.
These Cyrus packages are included in the default RedHat installation.