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[Nathaniel Borenstein]

It sounds like you might be interested in the Andrew Message System.  AMS was
designed for the Andrew File System, but also works on NFS or with no central
file system.  Most of it is distributed as part of the Andrew release on the
X11 R2 tape from MIT.  (Some parts of it haven't made it onto the R2 release,
but are expected to be on the R3 release this fall.)  A good overview paper
about it can be found in the February, 1988 USENIX proceedings.  Basically, it
does just about everything you ask for and a whole lot more, including, IF
you're on a high-function workstation running X11, handling multi-media mail
with rasters, animations, music, and so on.

For more information, especially if you can't get ahold of the USENIX paper
and/or MIT release, please send mail to me or to info-andrew at andrew.cmu.edu.