Close And Reopen The Email App

1. Open the email app that is not working.
2. Swipe up from the bottom of your app’s  display to access the app scroller.
3. Touch the problematic app, then drag it upward until it leaves the screen.
4. Touch anywhere to exit the app scroller.
5. Return to your Home screen.
6. Try opening the email app again.

Why this works:

Sometimes, an app can experience a minor software bug that prevents it from loading properly. It’s possible that simply closing the email app and opening it again might resolve your issue completely.