Rules for downgrading messages from X.400/88 to X.400/84 when MIME content-types are present in the messages
Harald Tveit Alvestrand, Josep Maria Ibáñez Romaguera, K Jordan · 1993
This document describes how RFC-1328 must be modified in order to provide adequate support for the scenarios: It replaces chapter 6 of RFC-1328. The rest of RFC-1328 is NOT obsoleted. [STANDARDS-TRACK]