Turn new message alert pop-up on or off - Microsoft Support
https://support.microsoft.com/en-us/office/turn-new-message-alert-pop-up-on-or-off-9940c70e-b306-442e-a856-d94b20318481
WebSelect File > Options > Mail. Under Message arrival, select or clear the Display a Desktop Alert check box and then select OK. Note: To suppress or enable other notifications such as sounds, mouse pointer changes, or displaying an envelope icon in the taskbar, check or clear the respective check boxes for those functions.
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