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 3 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.
What's new in this version:
Fixed: Certain messages caused corruption of the drafts summary database.
Fixed: "edit as new message" on a received message pre-filled the sender as the composing identity.
Fixed: Disposition-Notification-To could not be used in mail.compose.other.header