Mail Users' Shell
<messaging> (mush) A MUA for Unix and MS-DOS. It has both line-mode and
full-screen interfaces as well as a SunView interface.
mush provides a very powerful shell interface with a csh-like scripting
language, plenty of environment variables, command-line aliases, filename
completion, conditionals, and command piping.
z-mail is a more recent commercial version of mush.
Usenet newsgroup: comp.mail.mush.
mail server « Mail Transport Agent « mail user agent
Mail Users' Shell » MAINBOL » Main Distribution
Frame » mainframe