Distributed Electronic Mail Models in IMAP4, December 1994
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There are three fundamental models of client/server email: offline, online, and disconnected use. IMAP4 can be used in any one of these three models. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 4844.