MaXIM-11 - Mapping between X.400 / Internet mail and Mail-11 mail
RFC 2162

Document Type RFC - Experimental (January 1998; No errata)
Obsoletes RFC 1405
Last updated 2013-03-02
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Network Working Group                                      C. Allocchio
Request for Comments: 2162                             I.N.F.N. - Italy
Obsoletes: 1405                                            January 1998
Category: Experimental

           MaXIM-11 - Mapping between X.400 / Internet mail
                              Mail-11 mail

Status of this Memo

   This memo defines an Experimental Protocol for the Internet
   community.  It does not specify an Internet standard of any kind.
   Discussion and suggestions for improvement are requested.
   Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (1998).  All Rights Reserved.


   This document describes a set of mappings which will enable inter
   working between systems operating the ISO/IEC 10021 - CCITT (now ITU)
   X.400 Recommendations on Message Handling Systems, and systems
   running the Mail-11 (also known as DECnet mail or VMSmail) protocol.
   The specifications are valid both within DECnet Phase IV and
   DECnet/OSI addressing and routing scheme.

   The complete scenario of X.400 / MIME / Mail-11 is also considered,
   in order to cover the possible complex cases arising in multiple
   gateway translations.

   This document covers mainly the X.400 O/R address to/from Mail-11
   address mapping and the RFC822 to/from Mail-11 ones; other mappings
   are based on MIXER specifications. Bodypart mappings are not
   specified in this document: MIXER and MIME-MHS specifications can be
   applied to map bodyparts between X.400, MIME and Mail-11, too. In
   fact MIME encoding can be used without modifications within Mail-11
   text bodyparts.

   This document obsoletes RFC 1405, which was a combined effort of
   TERENA Working Group on Messaging, and the IETF X.400 Ops Working
   Group. This update was prepared by IETF MIXER working group.

Allocchio                     Experimental                      [Page 1]
RFC 2162                        MaXIM-11                    January 1998

Chapter 1 - Introduction

1.1. X.400

   The standard referred shortly into this document as "X.400" relates
   to the ISO/IEC 10021 - CCITT 1984, 1988 and 1992 X.400 Series
   Recommendations covering the Message Oriented Text Interchange
   Service (MOTIS). This document covers the Inter Personal Messaging
   System (IPMS) only.

1.2. Mail-11

   Mail-11, also known as DECnet mail and often improperly referred as
   VMSmail, is the proprietary protocol implemented by Digital Equipment
   Corporation (DEC) to establish a real-time text messaging system
   among systems implementing the DECnet Phase IV and DECnet/OSI (CLNS)
   networking protocols.

1.3. RFC822 / MIME

   RFC822 was defined as a standard for personal messaging systems
   within the DARPA Internet and is now diffused on top of many
   different message transfer protocols, like SMTP, UUCP, BITNET, JNT
   Grey Book, CSnet. MIME specifications allows transport of non-textual
   information into RFC822 messages. Their mapping with X.400 is fully
   described in MIXER and MIME-MHS. In this document we will consider
   their relations with Mail-11, too.

1.4. The user community

   The community using MIME or X.400 messaging system is currently
   growing in the whole world, but there is still a number of very large
   communities using Mail-11 based messaging systems willing to
   communicate easily with X.400 based Message Handling Systems and with
   MIME based systems. Among these large DECnet based networks we can
   include the High Energy Physics network (HEPnet) and the Space
   Physics Analysis Network (SPAN).

   Many other local communities actively use internally Mail-11 mailing
   protocols. As any other "non standard" mail protocol, using non
   standard mapping techniques between Mail-11 and standard mail systems
   can produce unpredictable results.

   For these reasons a set of rules covering conversion between Mail-11
   and X.400 or MIME is described in this document.

Allocchio                     Experimental                      [Page 2]
RFC 2162                        MaXIM-11                    January 1998

   This document also covers the case of Mail-11 systems implementing
   the "foreign mail protocol" allowing Mail-11 to interface other mail
   systems, including RFC822 based system.

Chapter 2 - Message Elements

2.1. Service Elements

   Mail-11 protocol offers a very restricted set of elements composing a
   Inter Personal Message (IPM), whereas X.400 and RFC822/MIME
   specifications support a complex and large amount of service
   elements.  Considering the case where a message is relayed between
   two X.400 MHS or MIME Message Transport System (MTS) via a Mail-11
   messaging system this could result in a nearly complete loss of

   To minimise the inconvenience, any of the X.400 or MIME service
   elements which do not map directly into Mail-11 equivalent ones
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