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X.400 Last modified: Friday, October 25, 2002
An ISO and ITU standard for addressing and transporting e-mail messages. It conforms to layer 7 of the OSI model and supports several types of transport mechanisms, including Ethernet, X.25, TCP/IP, and dial-up lines.
X.400 Standards Collection of links related to X.400 standards.	Related Categories Networking Standards Related Terms CCITT e-mail address X.500