The IMAP METADATA Extension, February 2009
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The METADATA extension to the Internet Message Access Protocol permits clients and servers to maintain "annotations" or "metadata" on IMAP servers. It is possible to have annotations on a per-mailbox basis or on the server as a whole. For example, this would allow comments about the purpose of a particular mailbox to be "attached" to that mailbox, or a "message of the day" containing server status information to be made available to anyone logging in to the server. [STANDARDS-TRACK]
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 4844.