my iPhone 6 email program will not open
I have an iPhone 6 with software version 12.4.8 . I have recently lost email. When I tap the "Mail" icon, the mail will load for a second, then the screen will go back to the main menu screen. If I try it a second time, the screen goes right back to the main menu. I tried deleting all email accounts, rebooting the phone, and reinstalling the accounts, but it did not work. Help, please!
iPhone 6