Definitions for "Mail gateway"
A machine that connects to two or more electronic mail systems (especially dissimilar mail systems on two different networks) and transfers mail messages among them.
n. A machine that connects two or more electronic mail systems (often, mail systems on different networks) and transfers messages between them.
A computer that connects two or more (possibly dissimilar) electronic mail systems and transfers messages between them. Sometimes the mapping and translation can be quite complex, and it generally requires a store-and-forward scheme whereby the message is received from one system completely before it is transmitted to the next system, after suitable translations. Some mail gateways also have the capability of selecting which messages will be allowed through, either on political or technical grounds. See also e-mail. WWWebfx Home Page