How to enable pop-up email notifications for Windows 10's Mail app

The built-in Mail app for Windows 10 isn't the most full-featured email client you can find, but it's a nice, light alternative to a web client. One thing you may be wondering, however, is why you aren't seeing pop-up Action Center notifications when you receive new emails. Easy! You have to turn them on first. But let me warn you: once you turn on notifications you'll get notified for every mail message you receive. Firing up your PC in the morning means a barrage of new mail notifications that...