| 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. Example of SMTP e-mail address: support@computerhope.com Example of a X.400 e-mail address: G=support; O=computerhope.com Where G is the given name. Additional information about the X.400 standard and its format can be found on RFC1327 and RFC1685. Also see: CCITT, E-mail, ISO, OSI
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