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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)
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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
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Parameters
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Description
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CAPABILITY
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None
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Asks the server to tell the client
what capabilities and features it supports.
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NOOP
(No Operation)
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None
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Does nothing.
This may be used to reset the inactivity timer or to periodically prompt
the server to send notification if new messages arrive.
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LOGOUT
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None
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Tells the server that the client
is done and ready to end the session, which transitions to the Logout
state for termination.
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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. |
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Version 3.0 - Version Date: September 20, 2005
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