Fort Knox acts as an e-mail server. Fort Knox handles that too. Install the Bandwidth Management feature and you can even control how many bits per second get allotted to everything from groups of users to types of data. The configuration tools are so simple to use, it almost makes administration fun. If you're not near the network you can still visit Fort Knox.
Administrators can dial in through the included modem to keep an eye on things from afar.
And if you have more than one Fort Knox on a network, you can configure them all from a single location with the central management feature. All this security doesn't cost a fortune, either. Sure, you could duplicate all the Fort Knox features for free using Linux, but Fort Knox's ease of use will save you a bundle in administration costs in the long run. So if your network is connected but not protected, give Fort Knox some serious consideration. Also keep an eye out for competitive products such as Internet Appliance's InternetPro Servers.