What recipient-end mail filters are available?

[Jonathan Corbet]

> I'm aware of two mail-filtering systems that operate at the
> recipient's end, procmail and Elm filter.  Are there others?

There is also the "slocal" filter that is part of the MH system.  One of
the many features of MH that help to keep me sane...

Jonathan Corbet
National Center for Atmospheric Research, Atmospheric Technology Division
corbet at stout.atd.ucar.edu