> Dumb question:  why won't MIME work with existing settings, such
> as IETFHDR?
>
> People using the other headings *probably* can't handle MIME anyway,
> so why do you want to forcibly set them to something where they may
> not be able to see *ANY* headers?
 
MIME will work with IETFHDR and FULLHDR, but not SHORTHDR.  Prior to
LISTSERV 1.8b, SHORTHDR was the default.  In 1.8b, FULLHDR became the
default, but those subscribers who subscribed before the installation
of 1.8b still have SHORTHDR as their setting (assuming the list was
taking the default).
 
I don't understand your comment about not being able to see any headers
with FULLHDR.