Galaxy s6. Wanted to delete/empty email Trash folder. Held down Trash to see if all could be deleted at once. Now everything is frozen. Trash is highlighted in red. Cannot access any mail folders.
Welcome to Android Central! If you press Home, do you go back to the homescreen? If so, then go to the App Manager, select the Email app, and tap Clear Cache/Force Stop. Now open it again.
If it's totally frozen, then force a shutdown by pressing and holding Power and Vol Down for about 15-20 seconds.