If you go to settings on the left hand side you will see icloud. Underneath will be your email address. This email address is also your Apple ID and also your 'My Exchange Account' for your iPad.
If you go into safari and log onto you email account there you can then add folders. Ie Outbox, drafts etc.
The mail icon in your iPad will send & receive emails but you have to manage them via safari. If you do not delete (the ones you don't want) them via safari you will just keep on using up the iPad memory.