Thunderbird 91.1.1

[German]The developers of the Thunderbird email client have released Thunderbird 91.1.1 as of September 16, 2021. This is a maintenance and security update for the 91 development branch, which makes minor fixes.


Older versions of Thunderbird are not yet updated to the 91 development branch. According to the release notes, menu item to disable subject encryption for a single message has been added. In addition, printing messages that are not currently displayed is no longer supported. Also, printing multiple messages at once no longer works, as this has been changed.  The update includes the following fixes.

  • Buttons on compose window dialogs did not have a visual indication of focus
  • Dropdown fields in message compose window were unreadable on Windows 7 with a dark theme
  • Multiple bulk mail notification warnings were displayed
  • Enabled/Disabled state of message filters did not persist as expected
  • Printing a message did not print a list of its attachments
  • Images attached from a web page were not sent as expected
  • OpenPGP public key was attached multiple times when forwading a message
  • Windows tray icon disappeared if Thunderbird was started by a shortcut with "Run" set to "Minimized"
  • Windows tray message count badge displayed the "unread" count instead of the "new" message count
  • Some downstream Thunderbird builds were incorrectly checking addons for a signature, causing all addons to be disabled
  • Addressbooks set up with autoconfig showed no search results
  • Various CardDAV setup and auto-detection fixes
  • Dates (such as birthday) stored in contacts may display the wrong date; a one-time manual fix may be needed for dates that are incorrect.
  • Attached VCards displayed as plain text when an email was HTML formatted
  • Mailing list names with non-ASCII characters incorrectly displayed with an error
  • LDAP directories were not searched for matches when adding recipients to an email
  • Clicking "Connect to an LDAP address book" in account setup opened CardDAV setup dialog
  • LDAP address books using Kerberos/GSS-API authentication did not authenticate
  • LDAP search queries containing non-ASCII characters produced no results
  • IRC server connections did not automatically retry after a timeout
  • Calendar event editor did not honor mail.spellcheck.inline

System requirements

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

  • Windows: Windows 7, Windows Server 2008 R2 or higher
  • Mac: Mac OS X 10.12  or higher (macOS 11.0 for Silicon)
  • Linux: GTK+ 3.14 or higher

The download of the free Thunderbird is available here. Thanks to Jörg for the hint.

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