RFC 987 (rfc987) - Page 2 of 69

Mapping between X

RFC 987                                                        June 1986
Mapping between X.400 and RFC 822


Chapter 1 -- Overview

   1.1.  X.400

      The X.400 series protocols have been defined by CCITT to provide
      an Interpersonal Messaging Service (IPMS), making use of a store
      and forward Message Transfer Service.  It is expected that this
      standard will be implemented very widely.  As well as the base
      standard (X.400), work is underway on various functional standards
      of profiles which specify how X.400 will be used in various
      communities.  Many of the major functional standards (e.g. from
      CEPT, CEN/CENELEC, and NBS) are likely to be similar.  Some of the
      decisions in this document are in the light of this work.  No
      reference is given, as these documents are not currently stable.

   1.2.  RFC 822

      RFC 822 evolved as a messaging standard on the DARPA (the US
      Defense Advanced Research Projects Agency) Internet.  It is
      currently used on the ARPA-Internet in conjunction with two other
      standards: RFC 821, also known as Simple Mail Transfer Protocol
      (SMTP) [Postel82a], and RFC 920 which is a specification for a
      domain name system and a distributed name service [Postel84a].
      RFC 822, or protocols derived from RFC 822 are used in a number of
      other networks.  In particular:

         UUCP Networks

            UUCP is the UNIX to UNIX CoPy protocol , which is usually
            used over dialup telephone networks to provide a simple
            message transfer mechanism.  There are some extensions to
            RFC 822, particularly in the addressing.  They are likely to
            use domains which conform to RFC 920, but not the
            corresponding domain nameservers [Horton86a].

         CSNET

            Some portions of CSNET will follow the ARPA-Internet
            protocols. The dialup portion of CSNET uses the Phonenet
            protocols as a replacement for RFC 821.  This portion is
            likely to use domains which conform to RFC 920, but not the
            corresponding domain nameservers.

         BITNET

            Some parts of BITNET use RFC 822 related protocols, with
            EBCDIC encoding.


Kille