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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 2 of 4)
Command Groups
IMAP commands are organized into
groups based on which session
states the IMAP session may be in when
they are used. These groups are:
- Any State Commands: A small
number of commands that can be used at any time during an IMAP session.
- Not Authenticated State Commands:
Commands that can be used only in the Not Authenticated state.
They are usually used for authentication, of course.
- Authenticated State Commands: These
commands are used to perform various actions on mailboxes. (Note that
despite the name, these commands can also be used in the Selected
state.)
- Selected State: A set of commands
for accessing and manipulating individual messages that can be used
only in the Selected state.
The reason for having the distinct
Authenticated and Selected states and command groups is
that IMAP is designed specifically to enable the manipulation of multiple
mailboxes. After the session starts and the client is authenticated,
the client is allowed to issue commands that work with entire mailboxes.
However, it may not issue commands that manipulate individual messages
until it tells the server which mailbox it wants to work with, which
puts it in the Selected state. The client can also issue mailbox
commands from the Selected state.
Note: In addition to these four groups, the standard also defines an extension mechanism that allows new commands to be defined. These must begin with the letter X. |
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Version 3.0 - Version Date: September 20, 2005
© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
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