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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 Authenticated State: Mailbox Manipulation/Selection Process and Commands
(Page 2 of 2)
The SELECT and EXAMINE Commands
When either the SELECT or
EXAMINE command is successfully issued, the server will return
to the client a set of useful information about the mailbox, which can
be used to guide commands issued from the Selected state. This
information includes the following three mandatory responses:
- <n> EXISTS: Tells the client
the number of messages in the mailbox.
- <n> RECENT: Tells the client
the number of recently-arrived (new) messages.
- FLAGS (<flag-list>): Tells
the client which flags are supported in the mailbox. These include the
following: \Seen, \Answered, \Flagged
(marked for special attention), \Deleted, \Draft
and \Recent. (The backslashes are part of the flag names.)
The reply from the server may also
contain these optional replies:
- UNSEEN <n>: The message number
of the first unseen message.
- PERMANENTFLAGS (<flag-list>):
A list of flags (as for the FLAGS response above) that the client
is allowed to change.
- UIDNEXT <n>: The next unique
identifier value. This is used to check for changes made to the mailbox
since the client last accessed it.
- UIDVALIDITY <n>: The unique
identifier validity value, used to confirm valid UID values.
Key Concept: In the Authenticated state, the IMAP client can perform operations on whole mailboxes, such as creating, renaming or deleting mailboxes, or listing mailbox contents. The SELECT and EXAMINE commands are used to tell the IMAP server which mailbox the client wants to open for message-specific access. Successful execution of either command causes the server to provide the client with several pieces of important information about the mailbox, after which the session transitions to the Selected state.
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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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