extsmail - 2.4-2 main

extsmail masquerades as the standard UNIX sendmail program, reading
messages, and later piping them to user-defined commands.
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In a sense, extsmail can be thought of as a very simple "tiny" sendmail
(Think SSMTP, UUCP, ...)
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A typical use is to allow e-mail to be piped via ssh to external servers
running a full sendmail-compatible MTA. extsmail is designed to have
sensible defaults, and configuring it is a one-off, quick job.