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Many computer systems are connected through networks. Networking may be achieved through network cables, telephone lines, and satellite links. If your SCO OpenServer system is part of a network, you can send mail to users on other UNIX systems on the network.
Because there are a large number of possible destinations, and because logins are not unique, it is necessary to send mail using an ``address'' which specifies not only the recipient's name but the organization, department, and even a specific machine to which it is to be sent. (This is equivalent to a postal address.)
For full details of addressing conventions, see
``Addressing mail to users on other systems''.