> The point I want to focus on, though, is that by *not* passing
> these headers, the rest of the message body is rendered useless.
> I understand the reasoning behind why LISTSERV removes
> unnecessary headers. My argument is that the MIME headers are
> becoming necessary, and should be passed through as part of the
> default set.
 
I agree.  Two or three additional headers will make no difference
to a user with a non-MIME mail system who is confronted with a
MIME message, while they will really help someone who does have
MIME capability.