It's PGML, and it's still pretty rough around the edges. As is
support for XML/HTML mail (although there is at least a draft on
that topic to encourage some standardization). Yes, it would be
nice to create a list specifically to experiment with extended-
content mail (not this one--the public list should use proven
standards), but I doubt the value of added content will outweigh
the immaturity of the standards for at least a year.
There is hope on the horizon--the Mozilla source release includes
its next-generation fully HTML4/CSS1-compliant extensible layout
engine, which will probably form the foundation of many free apps
in the not-so-distant future (it, too, unfortunately, is immature),
which will hasten standardization of extended formats.
-- Lee Daniel Crocker <lee@piclab.com> <http://www.piclab.com/lcrocker.html> "All inventions or works of authorship original to me, herein and past, are placed irrevocably in the public domain, and may be used or modified for any purpose, without permission, attribution, or notification."--LDC