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The set of ITU-T communications standards covering electronic mail services provided by data networks. X.400 was widely used in Europe and Canada.

X.400 addresses tend to be much longer than RFC 822 ones. They consist of a set of bindings for country (c), administrative domain (a), primary management domain (p), surname (s), given name (g).

For example, the X.400 address,

c=gb;a=attmail;p=Universal Export;s=Bond;g=James;

might be equivalent to RFC 822



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.400Code     Purpose

 /c=      country

 /admd=   administrative management domain
           (public email service)

 /prmd=   private management domain
           (inhouse email)

 /o=      organization

 /s=      surname

 /g=      given name
References in periodicals archive ?
This tumor shows sharp demarcation between conventional low-grade myxoinflammatory fibroblastic sarcoma consisting of scattered neoplastic cells within an inflammatory fibromyxoid background with arrow indicating a neoplastic cell with inclusion-like nucleolus (A), and high-grade undifferentiated sarcoma with fascicles of pleomorphic spindle cells, brisk mitotic activity, and atypical mitoses (B) (hematoxylin-eosin, original magnification X400 [A and B]).
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3: Image that indicates Kupffercells in the blood sinusoid (arrow X400 (H&E).
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The EOTech Insight M6X, Streamlight TLR-4 and SureFire X400 are three weapon light/laser combination units that I've used and can recommend.
SureFire X400 Ultra-Red Laser LED WeaponLight There is an M I L-STD-1913 rail interface on the frame's dust cover to which we attached a SureFire X400 Ultra Red Laser LED WeaponLight, which is the flagship of SureFire's small weaponlight product line.
L'eHub a ete concu pour repondre a toutes les normes de l'IATA et aux besoins d'interface client, notamment de type B, SMTP XML, X400, fax, SMS ou encore de type X", a declare Alexis Hickox, directeur principal, Solutions de l'avionique pour Rockwell Collins.
6 SureFire's X400 is a combination white light/laser aiming device.
95, Ruark at John Lewis blow the budget Toshiba Camileo X400 Camcorder, PS169.
I'VE BEEN WAITING TO GET MY HANDS ON SureFire's X400 for over a year.
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