[Mimedefang] action_bounce html mail

[tonj]

> The fact that most spam messages contain HTML doesn't imply that most
> HTML messages are spam.  You will have many, many false-positives.

yes I know that but I'm not too worried and I do intend to bring in a
whitelist. My server only handles my own mail, no-one  elses so there's no
great consequence. In my efforts to control junk mail I have to start 
somewhere and nothing ventured nothing gained.