Spam Assistance Needed

Hi!

We have a website with it's own unique e-mail address that is programmed to forward e-mails to our primary address through Outlook, which is not made public (make sense?). We are now starting to see more and more spam sent to the website address and bounced to our primary address. We can't disable the forward because we do have clients that contact us through the website. We have everything set at high security levels, we have Ad-Aware and updated Norton. On my junk mail exception list it says "do not search message for commercial or adult content" and I don't know how to tell it to "search" for that. Perhaps that would help? Any suggestions on identifying and blocking or eliminating spam would be appreciated. Keeping in mind that we can't block new client contact e-mails. We're running Windows XP and Outlook 2000 if that helps. Thanks.