Abstract
Electronic mail (e‐mail for short) originated as a way for computer users to send message files to other users on the same computer system. E‐mail’s usefulness has greatly increased today because so many of the world’s computers are connected to networks. A network can be as humble as one between two machines in a room, or as big as a globe‐spanning behemoth linking tens of thousands of machines at US military bases around the world. Whatever their size, more and more local networks are now interconnected with other networks. The link can be as inexpensive as the Unix program UUCP, a simple‐minded automatic program that uses a modem to call up other computers on the telephone, or as fancy as special‐purpose gateway hardware linking multiple fiber‐optic networks.
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