Rules for downgrading messages from X.400/88 to X.400/84 when MIME content-types are present in the messages

Harald Tveit Alvestrand, James A. Romaguera, Kevin E. Jordan. Rules for downgrading messages from X.400/88 to X.400/84 when MIME content-types are present in the messages. RFC, 1496:1-5, August 1993. [doi]

Abstract

Abstract is missing.