Let us solve the simple needs of transmitting a simple document
before attempting to get multipart documents correct! Divide and
conquer.
I'll disagree here. Because we know they exist and believe they will
continue to exist, it is our responsibility to try hard to make sure
they're covered by whatever solution we come up with. It's fine for us to
eventually say "nope, we couldn't handle it so here's a system for
single-parts only", but we need to try. Otherwise, a MIME-creating program
with an outgoing document won't be able to figure out how to tag it.
--Paul Hoffman, Director
--Internet Mail Consortium