Mapping between X.400(1988) / ISO 10021 and RFC 822
RFC 1327

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Network Working Group                                S. Hardcastle-Kille
Request for Comments: 1327                     University College London
Obsoletes: RFCs 987, 1026, 1138, 1148                           May 1992
Updates: RFC 822

          Mapping between X.400(1988) / ISO 10021 and RFC 822

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.

Abstract

   This document describes a set of mappings which will enable
   interworking between systems operating the CCITT X.400 1988)
   Recommendations on Message Handling Systems / ISO IEC 10021 Message
   Oriented Text Interchange Systems (MOTIS) [CCITT/ISO88a], and systems
   using the RFC 822 mail protocol [Crocker82a] or protocols derived
   from RFC 822.  The approach aims to maximise the services offered
   across the boundary, whilst not requiring unduly complex mappings.
   The mappings should not require any changes to end systems. This
   document is a revision based on RFCs 987, 1026, 1138, and 1148
   [Kille86a,Kille87a] which it obsoletes.

   This document specifies a mapping between two protocols.  This
   specification should be used when this mapping is performed on the
   DARPA Internet or in the UK Academic Community.  This specification
   may be modified in the light of implementation experience, but no
   substantial changes are expected.

Table of Contents

   1          - Overview ......................................    3
   1.1        - X.400 .........................................    3
   1.2        - RFC 822 .......................................    3
   1.3        - The need for conversion .......................    4
   1.4        - General approach ..............................    4
   1.5        - Gatewaying Model ..............................    5
   1.6        - X.400 (1984) ..................................    8
   1.7        - Compatibility with previous versions ..........    8
   1.8        - Aspects not covered ...........................    8
   1.9        - Subsetting ....................................    9
   1.10       - Document Structure ............................    9

Hardcastle-Kille                                                [Page 1]
RFC 1327        Mapping between X.400(1988) and RFC 822         May 1992

   1.11       - Acknowledgements ..............................    9
   2          - Service Elements ..............................   10
   2.1        - The Notion of Service Across a Gateway ........   10
   2.2        - RFC 822 .......................................   11
   2.3        - X.400 .........................................   15
   3          - Basic Mappings ................................   24
   3.1        - Notation ......................................   24
   3.2        - ASCII and IA5 .................................   26
   3.3        - Standard Types ................................   26
   3.4        - Encoding ASCII in Printable String ............   28
   4          - Addressing ....................................   30
   4.1        - A textual representation of MTS.ORAddress .....   30
   4.2        - Basic Representation ..........................   31
   4.3        - EBNF.822-address <-> MTS.ORAddress ............   36
   4.4        - Repeated Mappings .............................   48
   4.5        - Directory Names ...............................   50
   4.6        - MTS Mappings ..................................   50
   4.7        - IPMS Mappings .................................   55
   5          - Detailed Mappings .............................   59
   5.1        - RFC 822 -> X.400 ..............................   59
   5.2        - Return of Contents ............................   67
   5.3        - X.400 -> RFC 822 ..............................   67
   Appendix A - Mappings Specific to SMTP .....................   91
   Appendix B - Mappings specific to the JNT Mail .............   91
   1          - Introduction ..................................   91
   2          - Domain Ordering ...............................   91
   3          - Addressing ....................................   91
   4          - Acknowledge-To:  ..............................   91
   5          - Trace .........................................   92
   6          - Timezone specification ........................   92
   7          - Lack of 822-MTS originator specification ......   92
   Appendix C - Mappings specific to UUCP Mail ................   93
   Appendix D - Object Identifier Assignment ..................   94
   Appendix E - BNF Summary ...................................   94
   Appendix F - Format of address mapping tables ..............  101
   1          - Global Mapping Information ....................  101