From time to time i control my spam-directory in Outlook and i findpentax-maillist-emails. So watch out. Don't use phrases like a lot of dollar-signs to show that something is expensive. try not to use marketing language. i've found some mails with a tripple-dollar-sign. that made outlook to filter the mail (and it's follow ups).
Another option would be for you to use a slightly less inflexible spam-filtering system, of course... :-)
S
