X.400 Last modified: Friday, October 25, 2002
An ISO and ITU standard for addressing and transporting e-mail messages. It conforms to layer 7 of the OSI model and supports several types of transport mechanisms, including Ethernet, X.25, TCP/IP, and dial-up lines.
•E-mail this definition to a colleague• For internet.com pages about X.400 . Also check out the following links! X.400 Standards Collection of links related to X.400 standards.	Networking Standards CCITT e-mail address X.500 Give Us Your Feedback Shopping X 400 Products Compare Products,Prices and Stores Shop by Category: Office Supplies 554 Store Offers Random Access Memory (RAM) 1198 Model Matches Hard Drives 53 Store Offers Tools and Accessories 880 Store Offers Health Aids 690 Store Offers