This article is from the LAN Mail Protocols FAQ, by John Wobus jmwobus@syr.edu with numerous contributions by others.
ACAP (Application Configuration Access Protocol), formerly IMSP
(Interactive Mail Support Protocol), is a protocol which is being
developed to compliment IMAP4 by offering related e-mail services
beyond the scope of IMAP4. It includes the ability to subscribe find &
subscribe to bulletin boards, mailboxes, and to find and search
address books.
 
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