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AlertSwitch

Simply turn on or turn off the alerts shown & sounds played when new message arrives.

Rated 4 out of 5 stars (6)
729 users

Scriptable Notifications

Allows you to define an external script (bash, batch, python, ...) which is called so you can manage mail notifications / alerts the way you want.

Snap/Flatpak versions of Thunderbird not supported.

Rated 5 out of 5 stars (2)
295 users