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X.400

An OSI and ITU standard messaging protocol. It is an application layer protocol (layer 7 in the OSI model). X.400 has been defined to run over various network transports including Ethernet, X.25, TCP/IP and dial-up lines. See messaging protocol, XAPIA and CMC. Following is the format of an X.400 address:


  /c=  /admd=  /prmd=  /o=  /s=  /g=


  X.400
  Code     Purpose

 /c=      country

 /admd=   administrative management domain
           (public email service)

 /prmd=   private management domain
           (inhouse email)

 /o=      organization

 /s=      surname

 /g=      given name





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X+VX.500
X.12X.509
X.21X.75
X.25X.PC
X.28x.v.Color
X.29X1
X.3X10
X.32X11

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