This issue has sat with a status of 'Incomplete' for over four years now without any response so it is being closed. The upstream bug report is still open although this feature is unlikely to be implemented by either Mozilla or Ubuntu.
Closing as "Invalid" but probably should be "Won't Fix". ** Changed in: thunderbird (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/38988 Title: [wishlist] thread scoring rules To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/38988/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs