| Postmaster implements an ESMTP server. Given a configuration,
it starts up and listens for incoming SMTP connections, handles
them, and pipes the accepted e-mail messages into an arbitrary
local mailer of your choice. A good local mailer is Procmail.
Beyond that, you can configure and modify every little step
of the SMTP transaction. All the real work is done through
a call-back function. Postmaster triggers an event every time
a state change is required, and hopes that the call-back does
whatever is necessary.
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Network