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
JNT Mail Networks
A number of X.25 networks, particularly those associated with
the UK Academic Community, use the JNT (Joint Network Team)
Mail Protocol, also known as Greybook [Kille84a]. This is used
with domains and name service specified by the JNT NRS (Name
Registration Scheme) [Larmouth83a].
The mappings specified here are appropriate for all of these
1.3. The need for conversion
There is a large community using RFC 822 based protocols for mail
services, who will wish to communicate with users of the IPMS
provided by X.400 systems. This will also be a requirement in cases
where communities intend to make a transition to use of an X.400
IPMS, as conversion will be needed to ensure a smooth service
transition. It is expected that there will be more than one gateway,
and this specification will enable them to behave in a consistent
manner. Note that the term gateway is used to describe a component
performing the protocol mappings between RFC 822 and X.400. This is
standard usage amongst mail implementors, but should be noted
carefully by transport and network service implementors.
Consistency between gateways is desirable to provide:
1. Consistent service to users.
2. The best service in cases where a message passes through
1.4. General approach
There are a number of basic principles underlying the details of the
specification. These principles are goals, and are not achieved in
all aspects of the specification.
1. The specification should be pragmatic. There should not be
a requirement for complex mappings for "Academic" reasons.
Complex mappings should not be required to support trivial
2. Subject to 1), functionality across a gateway should be as
high as possible.
3. It is always a bad idea to lose information as a result of
any transformation. Hence, it is a bad idea for a gateway
Kille [Page 4]