e mail help

I've had this happen to me too. The solution I use is to quit Mail like this--

Go to the Home screen and double click the Home button. That will reveal the row of recently used apps at the bottom of the screen. Tap and hold on the app in question until it wiggles and displays a minus sign. Tap the minus sign to actually quit the app. Then tap anywhere on the screen above that bottom row to return the screen to normal. Then restart the app and see if it works normally.

The app is question of course is Mail.

Or better yet make sure you have data connection. LOL

I think that Ralph's solution will work, but if it doesn't, reset the iPad.

Reset the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider - let go of the buttons.