Release Notes

Thunderbird Desktop

Version 91.8.1 | Released April 18, 2022

Check out the notes below for this version of Thunderbird. As always, you’re encouraged to tell us what you think, or file a bug in Bugzilla.

For more on all the new features in Thunderbird 91, see New in Thunderbird 91.0.

System Requirements: Details

  • Windows: Windows 7 or later
  • Mac: macOS 10.12 or later
  • Linux: GTK+ 3.14 or higher

What’s Fixed


CLIENTID extension to SMTP was not supported by smtp-js


Additional SMTP errors now propagated to user


OpenPGP was not able to use some previously supported key types


OpenPGP Key Manager did not always display correct information after importing additional IDs


Duplicate new mail notifications could be displayed when server-side filters were in use


Cancelling an SMTP password entry resulted in multiple failure dialogs being displayed

Learn What’s Next

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