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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 General Operation, Client/Server Communication and Session States
(Page 3 of 3)
Normal Session Establishment and Greeting
The server determines in which state
the IMAP session begins, and sends a greeting message to tell
the client the session is established and indicate which state it is
in. Normally, the server will begin the session in the Not Authenticated
state. This is conveyed to the client with the normal OK greeting
message, such as this:
* OK <server-name>
In certain circumstances, a server
may already know the identity of the client, perhaps as a result of
some external authentication mechanism not part of the IMAP protocol.
In this case, a special greeting is used:
* PREAUTH <server-name>
server ready, logged in as <user-name>
This tells the client that it is
already in the Authenticated state.
If the server decides for whatever
reason not to accept a new session from the client, it can respond with
a BYE response instead of OK or PREAUTH, and close
the TCP connection.
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
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