I hate spam! Luckily if you are a Linux/KDE user your options for solving the spam dilemma are better than most. SpamAssassin is a heuristic email filter for tagging unsolicited commercial email. It does text and header analysis, checks blacklists, and will even use Vipul’s Razor.
This innovative Open Source product can be put together with a properly configured email client to filter out unsolicited spam. This is the tutorial I used to configure SpamAssassin with Kmail. Some additional spam filter/Kmail information (including more information for using SpamAssassin with Kmail) can be found here.