HP 3000 Manuals HP 3000 Manuals
Chapter 2 X.400 Message Handling System Overview This chapter explains the basic concepts of X.400 and the X.400Message Handling System. It also provides a basic understanding of the X.400 standard, which are based on the CCITT X.400 Recommendations (1984). The X.400 standard is part of the Application and Presentation layers of the OSI model.