Exchange Spam Filter

I just got done doing some short-term contract installation work which included setting up an Exchange server for internet email. The client is basically computer illiterate and remarkably paranoid. He wanted a suggestion for a product that would filter spam out. Seeing as how I would rather have been installing Postfix or Qmail, I didn't really have an answer to give him.

I was hoping someone out there could suggest a reasonably quality product that will filter spam for Exchange 2000 and that requires very little knowledgeable administration.

Have a look at the RBL stuff here. Some of them say they work with Exchange. I haven't personally used them since I also use Postfix but *shrug*

I've had very good results using RBL and SpamAssassin with Vipul's Razor. Not much good for Windows tho...

- Trevor

While we're on the subject, could someone point me at some instructions for installing SpamAssassin on qmail. But _not_ in my .qmail file -- I want to add the headers as the email goes through the inbound queue. I've got the QMAILQUEUE patches installed already.