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IMAP Not Authenticated State: User Authentication Process and Commands (Page 1 of 2) An IMAP4 session begins with an IMAP4 client establishing a TCP connection with an IMAP4 server. Under normal circumstances, the IMAP4 server has no idea who the client is, and therefore starts the session in the Not Authenticated state. For security reasons, the client is not allowed to do anything until it is authenticated. Thus, the only purpose of this state is to allow the client to present valid credentials so the session can move on to the Authenticated state. The IMAP4 standard defines three different mechanisms by which a client may authenticate itself. These are implemented using one or more of the three different commands allowed only in the Not Authenticated state, which are shown in Table 260.
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