Why does my iPad delete my email by itself

Ummm ..... you've just marked your own question as 'Answered already', which means that not too many people are going to be looking at it.

Beyond that .... give us a break! Your post provided absolutely zero information useful for letting anyone else even get started on figuring out why your iPad is "automatically deleting your email". If you have any trouble with that opinion of mine, please answer the following: "My car won't start. Why?" You can now start making guesses as to all the possible reasons why it won't start. Good luck!

And beyond that ... you post your first question at 3:06 pm, then ... three whole minutes later .... you tack on an impatient "What is the answer?" Seriously?