The iPad can be a great device to use to not only check your email, but to send messages as well. When you're done reading a particular message, deleting email on your iPad is exceptionally simple to do and will only take a few seconds.
Press the mail icon on your iPad home screen in order to launch your mailbox. If you are already in mail, exit out to the list of all of your messages.
Swipe your finger to the right on your iPad on top of the email message you would like to delete. A red "Delete" button will appear.
Press the "Delete" button in order to remove the message from your email. The email will be deleted from your iPad as well as your email account in general.