[Evolution] html format for e-mail (how do you exclude certain individuals)

[Chuck <wolvern flashmail com>]

I normally send everything in html code but at the college where I work my window using friends use groupwise which hates html e-mail.  How can I turn it off for only mail that I send to those users?

Thanks,
Chuck

maybe a bug or mod or something to make some of us even happier with evolution!