» Anti-Spam
Cisco IronPort AntiSpam - http://www.ironport.com/technology/ironport_antispam.html
Symantec Brightmail Gateway - http://www.symantec.com/business/brightmail-gateway
McAfee Email Security Appliance - http://www.mcafee.com/us/enterprise/products/email_and_web_security/email/email_security_appliance.html