Mozilla Thunderbird makes e-mailing safer, faster, and easier with such features as intelligent spam filters, a built-in RSS reader, and quick search. Thunderbird was designed to prevent viruses and to stop junk mail. Thunderbird includes tabbed e-mail, new search tools and indexing, smart folders, support for Firefox's Personas, a simplified setup wizard, and robust junk protections that include phishing and spam filters. Thunderbird has a junk mail tools have been updated to stay ahead of spam and features Phishing protection.
What's new in this version:
Version 16.0.2 has fixed an issue where IMAP based accounts could sometimes continuously download emails.