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IMAP (Advantages (Access to MIME message parts and partial fetch, Message…
IMAP
Advantages
Access to MIME message parts and partial fetch
Message state information
Multiple clients simultaneously connected to the same mailbox
Multiple mailboxes on the server
Connected and disconnected modes of operation
Server-side searches
Built-in extension mechanism
Internet Message Access Protocol
Used by email clients to retrieve email messages from a mail server over a TCP/IP connection
Designed with the goal of permitting complete management of an email box by multiple email clients
Clients generally leave messages on the server until the user explicitly deletes them
Server typically listens on port number 143
Virtually all modern e-mail clients and servers support IMAP
History
IMAP2
Interactive Mail Access Protocol
Introduced the command/response tagging
First publicly distributed version
Original IMAP
No copies of the original interim protocol specification or its software exist
implemented as a Xerox Lisp machine client and a TOPS-20 server
Some of its commands and responses were similar to IMAP2
Interim Mail Access Protocol
Interim protocol lacked command/response
Incompatible with all other versions of IMAP
IMAP3
IMAP3 was never accepted by the marketplace
IMAP3 is an extremely rare variant of IMAP
IMAP2bis
Extended to support MIME body structures
Mailbox management functionality
create
delete
rename
message upload
Never published in non-draft form
IMAP4