The SFDB filter has been developed exclusively by LogSat Software. This filter uses a very powerful resource to stop spam:
The entire global SpamFilter ISP user community.
This filter, along with the SFDE filter, is proving to be one of the most effective and accurate tools in stopping spam.
Anytime a company running SpamFilter ISP blocks an email, the sender's IP address is sent to our centralized SFDB database. This allows the SFDB filter to have access to a huge repository of spammer's IPs, updated in real-time by all the SpamFilter ISP installations in the world.
Our database analyzes this data in realtime, and will block IPs that have sent excessive amounts of spam to multiple locations in the world in the spam of the previous few minutes. This allows the SFDB to be extremely accurate, effective, and to start blacklisting IPs within minutes of them sending spam.
IP addresses from the database are automatically aged and removed from the database within 6-24 hours if they stop sending spam and/or viruses.