How do you "unfreeze" an email screen?
My email screen keeps freezing. How do you resolve this?
Try closing the Mail app completely : from the home screen (i.e.not with the Mail app 'open' on-screen) double-click the home button to bring up the taskbar, then press and hold any of the apps on the taskbar for a couple of seconds or so until they start shaking, then press the '-' in the top left of the Mail app to close it, and touch any part of the screen above the taskbar so as to stop the shaking and close the taskbar.
If that doesn't work then you could try a reset : press and hold both the sleep and home buttons for about 10 to 15 seconds (ignore the red slider), after which the Apple logo should appear - you won't lose any content, it's the iPad equivalent of a reboot.
If it keeps happening on a particular email then you may want to logon to your account via a browser and delete the email.