Try our hosted front end spam filtering out at Junk Email Filter for free. Your first bill will be December 1st 2011 if you decide to keep it. Until then it's free. We think that if you try it you'll be hooked.
To take advantage of this offer send an email to email@example.com
with coupon code DEC-01 in the body. We'll also need a list of the domains that you want to be filtered along with the name and email address of the person who the invoice will be sent to. We'll get your domains configured and send you back instructions about how to point your MX records to our filter.
This is a limited time offer for the first 1000 domains (not customers) who sign up. Once we get 1000 this offer will be discontinued.
Feel free to check out our web site at http://www.junkemailfilter.com
and let me know if you have any questions.