If you're new to Windows 10, you might be wondering why you're not getting email notifications from the new mail app. It's just a matter of turning them on for specific email addresses. In the mail app, click settings, then click notifications. Select which accounts you want notifications for, or apply your settings to all accounts. Turn on "Show notifications in the action center" and click the boxes next to "Show a notification banner" and "Play a sound." Now you'll never miss another email again!