Email problem in iOS6.

The problem is: I can't delete one particular email. I supposedly sent it to the trash folder. Navigating to the delete button is no problem. When I tap it, I get the warning I am about to delete the message. Am I sure? I tap it again, but, no matter what I try, the email will not disappear. Every other email will. I hope someone has an idea, because this is annoying! If this helps, I am using the new iPod Touch.