Hi, Just had some interesting stats I thought I'd share for the archive.
Originally, we only had a Mcafee Webshield protecting our MS Exchange Server. We were receiving approximately 2x as much spam as we email. If we received 10,000 emails, our Webshield would have trapped over 20,000 spam's. It is actually quite a good appliance.
Yesterday, to protect our system from a virus that the webshield was not catching, I implemented greylisting on an OpenBSD box in front of the webshield. I have been running greylisting at home for several years now, & know it's effective, but never had concrete numbers to measure against.
Overnight, our spamd protected webshield only received (caught) 191 spam emails, and processed approximately 4200 legitimate emails. Satistically, that should have been around 9000 spams processed in that timeframe. During that period, my server's whitelist has grown to over 700 email servers.
The good thing is that these emails have been blocked without receiving the body, so our bandwidth usage will be reduced.
Pretty impressive figures! Cheers, Steve Williams
