August 1999
Intermediate to advanced
378 pages
11h 44m
English
Content preview from Programming Internet Email
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IMAP Commands
Because IMAP is a complex protocol, it has many more commands than the simple POP protocols. This section provides a reference for all IMAP commands in the proposed standard. Each command and its possible server responses are described in detail.
Figure 11-1. IMAP usage for a mobile user
Just like the other protocols, any nonstandard commands, such as those proprietary commands that might be created by a particular vendor, are required to begin with an “X”.
Like POP, an IMAP consists of several distinct states. Some commands are only valid in a given state. Before detailing the commands themselves, a high-level look at the states is appropriate.
IMAP sessions may be in one of four states at any one time. These states are:
Nonauthenticated State
Authenticated State
Selected State
Logout State
Upon initial connection to an IMAP server, a client is in the Nonauthenticated State. A client enters the Authenticated State when a user log into the server, providing an appropriate type of authentication credentials.
Once logged in, a client may select a mailbox on which to operate. Selecting a mailbox puts the client in the Selected State and allows access to commands that operate on a mailbox.
The Logout State is entered when a client logs out, a server refuses service, or a connection is otherwise interrupted. This state lasts just long enough for the client and server to close a connection. ...
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