Here is an update for folks like me who use Thunderbird as a desktop email client and liked the Yahoo email notification...
Here are the steps:
Click on your User Icon (top right – Letter or Avatar)
Click on the Gear Symbol (Preferences)
Click on Categories under Notifications
Click in the Watched area and a box appears for you to type in. Start typing in the letter of the Category you would like to Watch (receive email notifications). If you want the list, type in a letter, then backspace to get rid of it and the list will appear. Select the desired item from the list, and it will be added.
To add more, just click in the Watched area and the box appears again… Repeat the above steps for all the Categories you want notifications on.
CLICK ON SAVE CHANGES.
In Thunderbird, make a message filter as desired for sorting. I used: From contains email@example.com and Moved the message to a custom folder.
This should be reasonably equivalent to the Yahoo Groups email notification.
Hope this helps.
P.S. You can reply to the email from Thunderbird, and it posts!