Caching proxies remember web pages and serve them up locally, saving both money and time. The most intelligent members of this family also remove dangerous content and provide transparent bridging.

Your Linux system may not be so airtight after all. To understand the threats, you need to think like an intruder. We'll show you what the intruders are thinking now about the Linux 2.6 kernel.

Sometimes the best time to stop bad mail is before it arrives. AmavisdNew is an Open Source interface for integrating spam and virus filtering with your mail server.

Linux may not be as virus-ready as Windows, but who wants to harbor pointless malware? Now you can hunt for viruses with KDE's KlamAV, a desktop front-end for the ClamAV Open Source virus protection system.

So you want a virus checker? We’ll show you what we found when we toured some of the top scanners for the Linux environment.

Some say an attack is looming, and others say we don’t have to worry. What’s the real story on viruses in Linux?

Content filters protect a web user’s privacy and keep the flood of unsolicited advertising at bay. We’ll show you a pair of popular Open Source content filters.

Even if you do not have a mail server of your own, SpamAssassin can help you filter out unsolicited junk mail. This article describes how SpamAssassin collaborates with Evolution and KMail. Thunderbird, on the other hand, has its own simple spam-detection feature.