Although I can hear beep to say emails are coming in the email program is blank and shuts down a few seconds after opening" has worked fine in the past.

i have an iPad 2 which has opened my BT emails fine until now but now when I click on mail I get a blank page and then it just shuts down. I have updated to latest iOS. I have tried deleting email account and adding back on but all to no avail. Strangely I can hear when an email is coming in and I get a pop up notification that I have an email from my vip contacts but still cannot open email program. Help!,