High Quality Content by WIKIPEDIA articles! X.400 is a suite of ITU-T Recommendations that define standards for Data Communication Networks for Message Handling Systems (MHS) — more commonly known as "e-mail". While X.400 never achieved the universal presence of Internet e-mail, it has seen use within organizations, and as part of proprietary e-mail products such as Microsoft Exchange. The first X.400 Recommendations were published in 1984 (Red Book), and a substantially revised version was published in 1988 (Blue Book). New features were added in 1992 (White Book) and subsequent updates. Although X.400 was originally designed to run over the OSI Transport service, an adaptation to allow operation over TCP/IP, RFC 1006, has become the most popular way to run X.400.

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