RFC 1496 (rfc1496) - Page 1 of 5

Rules for downgrading messages from X

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Network Working Group                                      H. Alvestrand
Request for Comments: 1496                                  SINTEF DELAB
Updates: 1328                                               J. Romaguera
                                                           NetConsult AG
                                                               K. Jordan
                                              Control Data Systems, Inc.
                                                             August 1993

     Rules for Downgrading Messages from X.400/88 to X.400/84 When
             MIME Content-Types are Present in the Messages

Status of this Memo

   This RFC specifies an IAB standards track protocol for the Internet
   community, and requests discussion and suggestions for improvements.
   Please refer to the current edition of the "IAB Official Protocol
   Standards" for the standardization state and status of this protocol.
   Distribution of this memo is unlimited.

Table of Contents

   1.  Introduction ...............................................    1
   2.  Basic approach .............................................    2
   3.  Conversion rules ...........................................    3
   3.1  EBP conversions to Basic ..................................    3
   3.2  Encapsulation format ......................................    3
   4.  Implications ...............................................    4
   5.  Security Considerations ....................................    4
   6.  Authors' Addresses .........................................    4
   7.  References .................................................    5

1. Introduction

   Interworking between X.400(88) and MIME is achieved by [4], which
   complements RFC-1327 [2], which in turn specifies the interworking
   between X.400(88) and RFC-822 based mail.

   Interworking between X.400(88) and X.400 (84) is achieved by RFC-1328
   [3]. That document does not describe what to do in the case where
   body parts arrive at the gateway that cannot be adequately
   represented in the X.400(84) system.

   This document describes how RFC-1328 must be modified in order to
   provide adequate support for the scenarios:

      SMTP(MIME) -> X.400(84)

      X.400(84) -> SMTP(MIME)



Alvestrand, Romaguera & Jordan
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