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mdrobbins 0 Newbie Poster

How do I turn off the new message notification that appears on my screen every time an e-mail arrives in Thunderbird?

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A short, practical answer for and anyone else: the pop-up can come from two places — Thunderbird itself, and macOS (Notification Center or a third-party notifier such as Growl). Disable the Thunderbird alerts first, then turn off system notifications if needed.

Open Thunderbird -> Preferences (or Settings) -> General. Under "When new messages arrive" uncheck options such as "Show an alert" and "Play a sound" (labels vary by Thunderbird version). If you see an option to "Use system notifications" you can toggle that off to keep everything inside Thunderbird.

If macOS is still showing banners or badges, open System Preferences (System Settings on newer macOS) -> Notifications (or Notifications & Focus). Find Thunderbird in the app list and turn off Allow Notifications or set the alert style to None and disable sounds/badges. This will stop Notification Center popups while leaving other Thunderbird behavior unchanged.

If the Dock icon keeps bouncing, that is a global Dock behavior. To turn off bouncing for all apps run in Terminal:

defaults write com.apple.dock no-bouncing -bool TRUE
killall Dock

Revert with ... no-bouncing -bool FALSE and killall Dock. Also check for Growl or notification add-ons (Mailbox Alert, etc.) in Thunderbird Add-ons and disable them if present. If changes do not take effect, restart Thunderbird and log out/in or reboot macOS.

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