In the past six months I've discovered about 10 pieces of legit mail in my filter 1-2 weeks after arrival. A couple times it was business mail with important attachments, which was embarassing. I've changed my business address to one that doesn't need filtering (for the moment).

I've been using Cloudmark's product since they launched a couple weeks back and it has successfully routed about 95% of SPAM for me. If you're not aware of it, it's a COM ADD-IN for Outlook (only supports Outlook now, not Express). It is an excellent peer-to-peer based SPAM utility. Truly excellent.

Sorry...

www.cloudmark.com

I've got at least a 95% accuracy ratio on my Spam filters. Maybe one or two "good" emails end up in the spam folder a week, but since I skim the folder daily its not a big deal. A quick right click on the improperly routed email ensures that sender goes to the inbox the next time. I use Pocomail as my mail client, which has a very nice spam filter built in.

I've had a few pieces of good mail in the filtered spam, too. I guess the trick is to check often. At first, it was so accurate at filtering garbage that I didn't check for a long time, and then realized a friend had sent an e-card that got filtered. Boy was I embarrassed. Now I check about once a week.