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        RFC 1506:
        RTR 6:

        Title:      A Tutorial on Gatewaying between X.400 and
                    Internet Mail
        Author:     J. Houttuin
        Mailbox:    houttuin@rare.nl
        Pages:      39
        Characters: 85,550
        Updates/Obsoletes:  none


There are many ways in which X.400 and Internet (STD 11, RFC 822) mail
systems can be interconnected. Addresses and service elements can be
mapped onto each other in different ways. From the early available
gateway implementations, one was not necessarily better than another,
but the sole fact that each handled the mappings in a different way
led to major interworking problems, especially when a message (or
address) crossed more than one gateway. The need for one global
standard on how to implement X.400 - Internet mail gatewaying was
satisfied by the Internet Request For Comments 1327, titled "Mapping
between X.400(1988)/ISO 10021 and RFC 822."  This tutorial was
produced especially to help new gateway managers find their way into
the complicated subject of mail gatewaying according to RFC 1327.

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Joyce K. Reynolds
USC/Information Sciences Institute