- Open the app switcher by double-pressing the Home button or swiping up from the bottom of the screen (if your iPhone doesn’t have a Home button).
- Swipe Mail up and off the top of the screen to close the app.
- Return to the Home screen and reopen the Mail app.
Why this works:
Closing and reopening the Mail app can fix a minor software issue. Mail gets a fresh start when you open it again.