Thunderbird 91.2.1


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.

What's new in Thunderbird 91.2.1:

  • Preference added to disable automatic pausing RSS feed updates after a fetch failure


  • Recipient address pills in an error state could incorrectly merge with mailing list pills when expanding the list
  • BCC-only messages could not be sent from the Outbox
  • Default DSN request was not set when using "Edit as New Message"
  • Vertical scrollbar in "Conversations" chat panel did not work correctly
  • Chat account "Advanced Options" dialog had no clickable buttons on macOS
  • RSS feed attachments could not be saved
  • Public ICS calendars served with an incorrect Content-Type could not be added
  • Setting a CalDAV calendar to manually update had no effect
  • CalDAV calendars set to read-only became writable after restarting Thunderbird
  • Saving a copy of a calendar invite (More -> Save As Copy) did not work
  • Events in the first or last week of a month were not always printed when printing a month view
  • Accessibility improvements; clearer display of area of focus
  • Various theme improvements, HiDPI improvements
  • "Attachments" menu panels for attached files were empty
  • Stability improvements

Download: Thunderbird 91.2.1 for Windows (EN/US) | 64-bit | ~50.0 MB (Open Source)
Download: Thunderbird 91.2.1 for Linux (EN/US) | 65.2 MB
Download: Thunderbird 91.2.1 for Mac OS (EN/US) | 119.0 MB
Download: Thunderbird 91.2.1 in other languages
View: Thunderbird Website | Release Notes | Screenshot

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