How to delete an email account from my Apple iPhone 6
Remove unwanted email accounts from your Apple iPhone 6. The associated contacts, calendar and email messages will also be removed.
1. Touch Settings.
2. Scroll to and touch Mail, Contacts, Calendars.
3. Touch the account you want to delete.
4. Touch Delete Account.
5. Touch Delete from My iPhone.
6. The email account has been removed.
Note: Some email accounts can't be removed. The Apple iPhone 6 may not allow you to remove the main Apple ID for example.