| (I) A IMAP4 "command" (better described as a transaction type, or
a protocol-within-a-protocol) by which an IMAP4 client optionally
proposes a mechanism to an IMAP4 server to authenticate the client
to the server and provide other security services. (See: POP3.)
(C) If the server accepts the proposal, the command is followed by
performing a challenge-response authentication protocol and,
optionally, negotiating a protection mechanism for subsequent POP3
interactions. The security mechanisms that are used by IMAP4
AUTHENTICATE--including Kerberos, GSSAPI, and S/Key--are described
in [R1731].
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