[rt-users] RT makes all messages multipart/mixed -- why?

[Daniel E. Eisenbud]

Would it be possible to make RT send out messages with just a single
attachment (principally messages where the content-type is text/plain)
with that content-type, instead of as multipart/mixed with a single
part?  Or is there some reason not to do this?  Specifically, the mail
gateway changes messages of the former form to the latter form.

-Dan