IMSP (Internet Message Support Protocol) is an Internet protocol that allows mail preferences and address books to be stored on a remote server. This is convenient for users who use email from multiple locations but want to maintain a single address book. IMSP is now known as ACAP (Application Configuration Access Protocol ).

(2006-01-09) Chris Limb nternet essage upport rotocol - a protocol used to join together various technologies used in email

IMSP is Internet Message Support Protocol.