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X.400 Message-Handling System

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The ITU (formerly CCITT) defined the X.400 MHS standard, an electronic system for exchanging messages among store-and-forward mail systems. In ISO terminology, X.400 is called MOTIS (Message-Oriented Text Interchange System). The goal of the standard is to provide compatibility among multi-vendor products and interfaces as well as public and private message services.

X.400 was first introduced in 1984 and has been through several enhancements. It outlines the protocols, procedures, components, terminology, and testing methods required to build interoperable e-mail systems. X.400 is based on a distributed client/server model. Internet mail has now become the de-facto mail standard.




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