Thunderbird

Thunderbird is a free, open-source, cross-platform application for managing email and news feeds. It is a local (rather than a web-based) email application that is powerful yet easy-to-use. Thunderbird is developed, tested, translated and supported by the folks at Mozilla Corporation and by a group of dedicated volunteers. Thunderbird gives you control and ownership over your email. There are lots of add-ons available for Thunderbird that enable you to extend and customize your email experience.

Thunderbird gives you IMAP/POP support, a built-in RSS reader, support for HTML mail, powerful quick search, saved search folders, advanced message filtering, message grouping, labels, return receipts, smart address book LDAP address completion, import tools, and the ability to manage multiple e-mail and newsgroup accounts.

Thunderbird 91.3.0 fixes:

  • Default mail headers were set incorrectly when the value contained a colon (:)
  • Thunderbird did not send the QUIT command when closing an SMTP connection
  • Mail tabs could not be closed using the context menu
  • "Print" context menu was still shown when no message pane was displayed
  • Windows tray icon did not reappear after restarting Windows Explorer
  • Compose window attachment drag and drop fixes
  • Various macOS stability improvements
  • Drag and Drop area for file attachments on Windows was incorrect
  • CardDAV address books without a name did not work
  • Thunderbird tried to refresh disabled and manual-only calendars when the network state changed from offline to online
  • Various Calendar event dialog fixes
  • Various security fixes

Download: Thunderbird 91.3.0 for Windows (EN/US) | 64-bit | ~50.0 MB (Open Source)
Download: Thunderbird 91.3.0 for Linux (EN/US) | 65.2 MB
Download: Thunderbird 91.3.0 for Mac OS (EN/US) | 119.0 MB
Download: Thunderbird 91.3.0 in other languages
View: Thunderbird Website | Release Notes | Screenshot