Mapping between X.400(1988) / ISO 10021 and RFC 822
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Auteur(s) : S.E. Kille
RFC 1138 Mapping X.400(88) and 822 December 1989
IT WILL NOT MAKE SENSE, EXCEPT IN THE CONTEXT OF RFC 822 AND
X.400 (1988). DO NOT ATTEMPT TO READ THIS DOCUMENT UNLESS
YOU ARE FAMILIAR WITH THESE SPECIFICATIONS.
This work was partly sponsored by the Joint Network Team. The
workshop at UCL in June 1989 to work on this specification was also
an IFIP WG 6.5 meeting.
The work in this specification was substantially based on RFC 987,
which had input from many people.
Useful comments and suggestions were made by Pete Cowen (Nottingham
Univ), Jim Craigie (JNT), Christian Huitema (Inria), Peter Lynch
(Prime), Julian Onions (Nottingham Univ), Sandy Shaw (Edinburgh
Univ), Einar Stefferud (NMA), and Peter Sylvester (GMD).
Chapter 2 -- Service Elements
This chapter considers the services offered across a gateway built
according to this specification. It gives a view of the
functionality provided by such a gateway for communication with users
in the opposite domain. This chapter considers service mappings in
the context of SINGLE transfers only, and not repeated mappings
through multiple gateways.
2.1. The Notion of Service Across a Gateway
RFC 822 and X.400 provide a number of services to the end user. This
chapter describes the extent to which each service can be supported
across an X.400 <-> RFC 822 gateway. The cases considered are single
transfers across such a gateway, although the problems of multiple
crossings are noted where appropriate.
2.1.1. Origination of Messages
When a user originates a message, a number of services are available.
Some of these imply actions (e.g., delivery to a recipient), and some
are insertion of known data (e.g., specification of a subject field).
This chapter describes, for each offered service, to what extent it
is supported for a recipient accessed through a gateway. There are
three levels of support:
The corresponding protocol elements map well, and so the
service can be fully provided.
Kille [Page 10]