X.400 Protocol Resources

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LMAP Lightweight Mail Access Protocol,
X.400 Message Handling services: Message Handling System and service overview
RFC1496 Rules for downgrading messages from X.400/88 to X.400/84 when MIME content-types are present in the messages
RFC1495 Mapping between X.400 and RFC-822 Message Bodies
RFC1328 X.400 1988 to 1984 downgrading,
RFC1327 Mapping between X.400(1988) / ISO 10021 and RFC 822

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