The answer is True. Mime is an extension to the old rfc 822 specification of an internet mail format . MIME is specified in detail in Internet Request for Comments 1521 and 1522, which amend the ASCII messaging header, RFC 822.
MIME (Multi-Purpose Internet Mail Extensions) is an extension of the original Internet e-mail protocol that lets people use the protocol. It is extended so that Internet clients and servers could recognize and handle other kinds of data than ASCII text. New file types were added to "mail" as a supported Internet Protocol file type.