Mozilla Thunderbird is a fully featured, secure and very functional email client and RSS feed reader. It lets you handle mail efficiently and with style, and Thunderbird filters away junk mail too. It offers a pretty and streamlined interface to a very powerful email package.

Not only is Thunderbird a secure email client, a sophisticated and very well integrated Bayesian spam filter knocks out most junk mail (after some training). Combine these two aspects of Thunderbird, and you get a sensible feature that automatically sanitizes (potentially dangerous) HTML code and turns off remote images for spam or anything else - worms, viruses - you classify as bad mail. Though not perfect, a scam sensor detects tactics commonly used to fool users. Read more.