IMAP Response Codes, May 2009
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IMAP responses consist of a response type (OK, NO, BAD), an optional machine-readable response code, and a human-readable text.
This document collects and documents a variety of machine-readable response codes, for better interoperation and error reporting. [STANDARDS-TRACK]
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 4844.