[ale] metamail?

[rebus at rebus.mindspring.com (Jim Philips)]

Metamail is part of the Andrew User Environment from Carnegie-Mellon. It
works a lot like .mailcap and tells your mail reader what program to
start when it finds an attachment. Andrew has been around for awhile,
but it is a pretty complete system, including a messaging system, a word
processor, a programming environment, a mail filtering system and, of
course, metamail. This message was sent with the Andrew Messaging
system.