SpamStopsHere...Soon

A 30-day trial, very good pricing, non-profit discount (if you call and ask the sales person, eh-hem (post)!), and it's all handled offsite. I believe SpamStopsHere (site) is what I was looking for. I haven't signed up and obviously I'm being premature as it might not be the solution, but I read good things about the service and it feels right. The trial-run will be beneficial and I will keep you posted on the outcome.