You can still use the Settings menu to disable all notifications from a specific app, but you might want to take a more granular level of control.
Remember, if you use a third-party mail client for Windows (or Microsoft's other official email app, Outlook) the process will differ. If you change your mind and want to turn your Mail notifications on again, you can simply reverse the steps we listed above. Slide the toggle next to Mail into the Off position. Scroll down to Get notifications from these senders.
In the left-hand panel, click on Notifications and actions. In the lower left-hand corner of the window, click on the Settings icon. To turn off mail notifications in Windows 10, just follow the simple step-by-step instructions below.