Navigate to Tools > Options. In Linux, go to Edit > Preferences in the menu. Open the General category in the settings. Make sure Show an alert is checked under When new messages arrive. If you’d like, configure the alert’s contents and display duration via Customize. Options include: Sender. Subject. Message Preview Text. Click OK and then Close.
How to Configure Thunderbird Alerts in Thunderbird on a Mac
Thunderbird alerts are controlled through macOS Preferences.
Sender. Subject. Message Preview Text.
Open System Preferences > Notifications. Go to Thunderbird. Slide the toggle to Allow Notifications from Thunderbird. Select the appropriate boxes, depending on your preferences.
