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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 1 2 3 4 IMAP Not Authenticated State: User Authentication Process and Commands

"Any State" Commands

Table 259 describes the IMAP “any state” commands, which can be used whenever needed.

Each command sent by the IMAP client elicits some sort of reaction from the IMAP server, of course. The server takes action based on what the client requested, and then returns back one or more text strings to indicate what occurred. There are actually two types of replies that the server can send after a command is received:

• Result: This is a reply usually indicating the status or disposition of a command. It may be tagged with the command tag of the command whose result it is communicating, or may be a general message that is not tagged.
  
  
• Response: Any type of information that is being sent by the server to the client. It is usually not tagged with a command tag and is not specifically intended to indicate server status.

IMAP General Operation, Client/Server Communication and Session States 1 2 3 4 IMAP Not Authenticated State: User Authentication Process and Commands