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The Barracuda firewall system blends together hardware and software to ward off spam, virus, spoofing, phishing and spyware and is compatible with any email system. It has the capacity to handle up to 100,000 users and millions of email messages per day. Several Barracuda firewall units can also be clustered together to increase your capacity even further. Your Barracuda firewall uses 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), all of which are set through the web based interface by your administrator. Barracuda firewalls can protect your network from either individual spam messages or brute force attacks.