> We were having problems with HTML in certain clients. Namely,
> Outlook 2000 wasn't rendering the code and was just showing the
> source.
>
> Earlier we had QUIET SET everyone on our lists to SHORTHDR for
> administrative reasons. We had also added this as a Default-Option
> in the header.
>
> Outlook requires normal long style headers to display HTML
> correctly.
>
> Moral of the story: If you are going to be distributing HTML to
> your lists, make sure you have standard headers set.

It's not just Outlook.  Setting SHORTHDR strips out the MIME headers
that are needed by all MIME-capable email clients.