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The TCP/IP Guide  9  TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)       9  TCP/IP Key Applications and Application Protocols            9  TCP/IP File and Message Transfer Applications and Protocols (FTP, TFTP, Electronic Mail, USENET, HTTP/WWW, Gopher)                 9  TCP/IP Electronic Mail System: Concepts and Protocols (RFC 822, MIME, SMTP, POP3, IMAP)                      9  TCP/IP Electronic Mail Access and Retrieval Protocols and Methods                           9  TCP/IP Internet Message Access Protocol (IMAP/IMAP4)

IMAP Commands, Results and Responses 1 2 IMAP Authenticated State: Mailbox Manipulation/Selection Process and Commands

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.

Table 260: IMAP Not Authenticated State Commands

Command	Parameters	Description
LOGIN	User name and password	Specifies a user name and password to use for authentication.
AUTHENTICATE	Authentication mechanism name	Tells the server that the client wants to use a particular authentication mechanism and prompts the client and server to exchange authentication information appropriate for that mechanism.
STARTTLS	None	Tells the IMAP4 server to use the Transport Layer Security (TLS) protocol for authentication, and prompts TLS negotiation to begin.

IMAP Commands, Results and Responses 1 2 IMAP Authenticated State: Mailbox Manipulation/Selection Process and Commands

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