Thunderbird Version 91.8.1

[German]The developers of the Thunderbird email client released Thunderbird 91.8.0 (see Firefox 99.0 and 91.8.0esr released) on April 5, 2022, and then released 91.8.1 as a bug fix update on April 18, 2022. These are maintenance updates for the 91 development branch that contain various fixes.


According to the Thunderbird release notes, the update to Thunderbird version 91.8.1 brings the following fixes.

  • CLIENTID extension for SMTP was not supported by smtp-js
  • Additional SMTP errors are now forwarded to the 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
  • When using server-side filters, duplicate notifications about new mails could be displayed
  • Canceling an SMTP password entry caused several error dialogs to be displayed

System requirements

The system requirements for the different operating system versions (see here for more details):

  • Windows: Windows 7 or higher
  • Mac: Mac OS X 10.9 or higher
  • Linux: GTK+ 3.14 or higher

The download of the free Thunderbird is available here.

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