I don't know how to do this, although it would be nice, and might be
possible.
However, keep in mind that many mail agents will detect undeclared html in a
plain text part of a message and render it just fine as html. So you in
general probably do want to run an html check across the plain text.
Loren
> Is it possible to write spamassassin rules that match ONLY in HTML-Parts
> of a message?
> I've written some rules that match just perfectly a lot of spam but it
> also matches some mails only having text parts which just happen to
> contain <'s and >'s...
