1. Open Settings.
  2. Tap Passwords & Accounts. In earlier versions of iOS, this might be called Mail or Mail, Contacts, Calendars. If you're not using the current iOS version, you might also have to then open Accounts.
  3. Select the email account you wish to remove.
  4. Tap Delete Account at the bottom of the list.
  5. Confirm by tapping Delete Account or, in some cases, Delete from My iPhone.