Barracuda Spam & Virus Firewall 400 Appliance 1U rackmount - Comprehensive Email Content Security - Features: - compatible with all email servers - handles up to 100,000 active email users - protects your email server with twelve defense layers: Network Denial of Service Protection, Rate Control, IP Reputation Analysis, Sender Authentication, Recipient Verification, Virus Scanning, Policy (User-specified rules), Spam Fingerprint Check, Intent Analysis, Image Analysis, Bayesian Analysis -