Thunderbird 45 is a fully featured, very functional, secure email client and RSS feed reader, created by Mozilla. It offers a pretty and streamlined interface to a very powerful email package.
Furthermore, it lets you handle mail efficiently and with style, and Thunderbird filters away junk mail too.
It is a sophisticated and very well integrated Bayesian spam filter knocks out most junk mail (after some training). Combine these two aspects, and you get a sensible feature that automatically sanitizes (potentially dangerous) HTML code.
Also 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.
Flexible views, free-form tags and powerful filters, search and virtual folders (which also work fine with IMAP accounts and across email accounts) make it a snap to handle large amounts of mail. The integrated RSS feed reader extends these abilities to news.