NWTech SMTP Filter – First line of defense is a stand alone SMTP mail server, filtering out the majority of email types we don't like. This also includes denial of email from non-email servers delivering email. Like from a hackers desktop.
LogSat SpamFilter – Key word filtering, and geo-location filtering. Currently we only recieve mail from NorthAmerica, unless told otherwise. The key word filter looks for explicit languange, as well as known gimmics for getting sales literature.(Viagra)