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The Dispatcher is one of the two major, "control" processes of the MTA (the other major such process being the Job Controller).

The MTA's Dispatcher is a multithreaded connection dispatching agent that permits multiple multithreaded server processes to share responsibility for a given service. When using the MTA's service Dispatcher, it is possible in particular to have several multithreaded SMTP server processes and several SMTP SUBMIT server processes running concurrently. In addition to having multiple server processes for a single service, each server process may have one or more active connections.

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