nmh - 1.8-3 main

This is the nmh mail user agent (reader/sender), a command-line based mail
reader that is powerful and extensible. nmh is an excellent choice for
people who receive and process a lot of mail.
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Unlike most mail user agents, nmh is not a single program, rather it is a
set of programs that are run from the shell. This allows the user to
utilize the full power of the Unix shell in coordination with nmh. Various
front-ends are available, such as mh-e (an emacs mode), xmh, and exmh (X11
clients).
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nmh was originally based on MH version 6.8.3, and is intended to be a
(mostly) compatible drop-in replacement for MH.