Barracuda firewall, exploring in depth
You can also cluster together several Barracuda firewall units to increase capacity even further. The system employs 12 defensive layers, such as denial of service protection, sender authentication, recipient verification, virus scanning, intent and image analysis, Bayesian analysis, rule based scoring and rate control (which is triggered when your system receives a large number of messages from a single IP address over a short period of time), that can be set by your administrator through the web based interface. Barracuda firewalls can protect your network from either individual spam messages or brute force attacks. In addition, the Barracuda antivirus system utilizes two separate filtering engines to stop potential system threats. The Barracuda firewall also has the capability to filter out messages containing certain designated extensions.