OpenBSD Based Mail Firewall

We have been running our new spam filter firewall protection system for about a year now with good success so far. It sits in front of our MailFoundry spam filter appliance and tarpits blacklisted ips, keeping those ips from hitting our MailFoundry and wasting smtp resources. It has a built in whitelist as well as an auto-learn blacklist mechanism based on parsing of the MailFoundry logs. if you have a MailFoundry appliance or similar device struggling to keep up with its workload (such as running out of smtp connections) then our solution may be just the ticket to cleaner, faster mail.