Download Mozilla Thunderbird 91.3.0

The Mozilla Foundation has released version 91.3.0 of Thunderbird. Thunderbird is an open source client for e-mail and newsgroups, with features such as support for various mail and news accounts, a spam filter, spell checker, and a customizable appearance. In version 91 includes a warning when an email is sent to a possibly non-existent address, or when there are too many addresses on the public address line. There is also support for CardDAV and a native client for a Mac equipped with an Apple Silicon processor. An update to 91 is now being offered from version 78. The following changes and improvements have also been made in this release:

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