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The Cyrus IMAP (Internet Message Access Protocol) server provides access to
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personal mail and system-wide bulletin boards through the IMAP protocol.
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The Cyrus IMAP server is a scaleable enterprise mail system designed for use
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from small to large enterprise environments using standards-based
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technologies.
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A full Cyrus IMAP implementation allows a seamless mail and bulletin board
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environment to be set up across multiple servers. It differs from other
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IMAP server implementations in that it is run on "sealed" servers, where
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users are not normally permitted to log in. The mailbox database is stored
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in parts of the filesystem that are private to the Cyrus IMAP system. All
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user access to mail is through software using the IMAP, POP3, or KPOP
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protocols.
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The private mailbox database design gives the server large advantages in
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efficiency, scalability, and administratability. Multiple concurrent
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read/write connections to the same mailbox are permitted. The server
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supports access control lists on mailboxes and storage quotas on mailbox
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hierarchies.
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See http://andrew2.andrew.cmu.edu/cyrus/imapd/ for further details.
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