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What is X.400?

X.400 was originally published in 1984 by CCITT and later re-written in 1988 jointly by ISO and CCITT. X.400 is a standard that conforms to layer 7 of the OSI and is a standard used for transporting e-mail messages. X.400 is an alternative standard to the commonly used SMTP and includes support for several transport connections including Ethernet, TCP/IP, and dial-up.

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