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X.400 Protocol

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DEFINITION: X.400 is the messaging (notably e-mail) standard specified by the ITU-TS (International Telecommunications Union - Telecommunication Standard Sector). It's an alternative to the more prevalent e-mail protocol, Simple Mail Transfer Protocol (SMTP). X.400 is common in Europe and Canada. It's actually a set of standards, each in the 400-number range.Because X.400 stipulates a number of possible address  … 
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X.400 PROTOCOL DEFINITION (continued): …  characteristics that SMTP does not, an X.400 address can be long and cumbersome. On the other hand, X.400 adherents note that it is an official standard whereas SMTP is a "de facto" standard. Thus, products with X.400 implementations can be tested more rigorously than products with SMTP implementations can. X.400 offers more capabilities than SMTP does. However, many of these capabilities are seldom used.An SMTP e-mail address that looks like this hypothetical address: georg.hansen@delab.sintef.nomight look like this in an X.400 e-mail message: G=Georg; S=Hansen; O=sintef; … 
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