iPad 2 allows users to configure different mails such as Gmail, Yahoo, Hotmail, Microsoft Exchange and others.
The default number of recent email messages is set to 50. But you can change recent messages using the Mail, Contacts, Calendars settings. Select the Settings option from the Home Screen, navigate to Mail, Contacts, Calendars option and then to the Mail Section on the right hand side.
In Mail Section, navigate to Show option which should display the values for the recent messages that has been currently defined. The Show option would display the following pre defined values as shown below.
Now to change the value for Recent Messages, select any one of the defined value and the selected value will be highlighted with a tick mark.