Spam Blocking And Web Filtering With The Untangle 5.3 Network Gateway

Untangle bundles common open-source applications for blocking spam, spyware, viruses, adware and unwanted content on the network in one single Linux distribution. It can be integrated into existing networks either as a router or as a transparent bridge (directly behind the router, but before the switch that connects the client PCs with the router). The best thing about Untangle is that you do not have to reconfigure the client PCs - Untangle works out of the box.

http://www.howtoforge.com/spam-blocking-and-web-filtering-with-the-untangle-5.3-network-gateway

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