High Quality Content by WIKIPEDIA articles! The X.445 is an ITU-T standard for sending X.400 traffic over standard telephone lines, a method known commonly as dial-up. It is also known as the Asynchronous Protocol Specification (APS). 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).

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