Postini-« Email Security, part of Postini's Communications Security solution, is the most comprehensive, flexible, and trusted spam and virus protection service. Based on its patented managed service platform, Postini blocks spam, phishing, viruses and other email threats before they can reach your email gateway. With no software or hardware to install, Postini Email Security-« is easy to implement, manage, and use. The Email Security Kit: 5 Mailbox Edition, includes everything you need to activate and configure your first year of Postini Email Security Enterprise Edition service for up to 5 mailboxes. You can add and protect more mailboxes at any time. The Email Security Kit is the best solution if you business has: 1 or more email addresses; 1 or more domains names with email accounts; 1 or more "generic" email addresses, such as "info", "sales", and "support"; An internal email server: Postini works with MS Exchange, Lotus Notes, Novell, and most any LINUX email server. When you buy, you will receive a CD