How to delete an email account from my Apple iPhone 5S
Remove unwanted email accounts from your Apple iPhone 5S. 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. Scroll to and touch Delete Account.
5. Touch Delete Account.
6. The email account has been removed.
Note: Some email accounts can't be removed. The Apple iPhone 5S may not allow you to remove the main Apple ID for example.