I had a teacher ask me today if there was a way to restrict access to the email app on her iPad. Unfortunately there is not a way to individually restrict access to most apps. The exception would be those apps under General->Restrictions but the only setting for email is to restrict changing accounts.
I did some Googling and found the following post from “SandiC” on the Apple forums:
I have been having the same problem. I was looking at a suggestion which did not work for me then discovered a solution. It is not ideal but will work. When done with email go to settings, mail/contacts… Touch your mail account. Touch mail off. The next time you want to access email you will have to log in with your user info and password.
Later in the discussion another piece of good advice from “Raghuveer”:
This would work when used in combination with restrictions. In restrictions, you can disable changes to your accounts like email in restrictions->accounts settings. Disable changes to accounts and switch off mail when passing it around.
For now this work around is going to have to work. Maybe in iOS 6 there will be independent app security.