<a href="http://www.surfcontrol.com/">SurfControl</a> is a well-established provider of software-based Web and email filtering tools, and the RiskFilter E-mail is the company's first stab at an appliance product. It’s a 1U rack-mount solution, based on an industry-standard Pentium 4 server, running a pre-configured, security hardened, Linux. This, in turn, hosts the SurfControl email antivirus, anti-spam and content filtering tools with a browser-based GUI for management. The RiskFilter E-mail E10 costs £8,500 (ex. VAT) for up to 500 users.