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Table Of Contents  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)

Previous Topic/Section
IMAP General Operation, Client/Server Communication and Session States
Previous Page
Pages in Current Topic/Section
12
3
4
Next Page
IMAP Not Authenticated State: User Authentication Process and Commands
Next Topic/Section

IMAP Commands, Results and Responses
(Page 3 of 4)

"Any State" Commands

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


Table 259: IMAP “Any State” Commands

Command

Parameters

Description

CAPABILITY

None

Asks the server to tell the client what capabilities and features it supports.

NOOP
(No Operation)

None

Does nothing. This may be used to reset the inactivity timer or to periodically prompt the server to send notification if new messages arrive.

LOGOUT

None

Tells the server that the client is done and ready to end the session, which transitions to the Logout state for termination.


Results and Responses

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.

Note: The IMAP standards sometimes use the terms “result”, “response” and “reply” in a manner that I find to be inconsistent. Watch out for this if you examine the IMAP RFCs.


Key Concept: IMAP servers issue two basic types of replies to client commands. Results are replies that indicate the success, failure or status of a command; responses are general replies containing many different types of information that the server needs to send to the client.



Previous Topic/Section
IMAP General Operation, Client/Server Communication and Session States
Previous Page
Pages in Current Topic/Section
12
3
4
Next Page
IMAP Not Authenticated State: User Authentication Process and Commands
Next Topic/Section

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Version 3.0 - Version Date: September 20, 2005

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