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Linux Email: Set up and Run a Small Office Email Server by Patrick Ben Koetter, Magnus Back, Alistair McDonald, Carl Taylor, David Rusenko

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Chapter 8. Busting Spam with SpamAssassin

SpamAssassin is a very popular open-source anti-spam tool. It is considered to be the best free, open-source, anti-spam tool, and better than many commercial products. In this chapter, we will learn how to download, install, and configure SpamAssassin to filter incoming e-mail. SpamAssassin can be effective in removing 80% to 95% of spam, with little effort from the system administrator.

Why Filter E-Mail?

If you don't receive any spam then there may be no need to filter spam. However, once one spam has been received, it is invariably followed by another; spammers can sometimes detect if a spam is viewed, and then know that an e-mail address is valid and vulnerable. If spam is filtered, then the initial ...

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