X.400

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X.400

(messaging)
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

James.Bond@UniversalExport.co.uk

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.400Code     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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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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