title: In SharePoint, export email of the user who created a list item
body: <p>I either want the email address or the user account of the user who created or modified a list item.</p>
  
  <p>I was thinking calculated field, but you can't do a calculated field on <em>created by</em> or <em>modified by</em> fields!</p>
  
  <p>Is this possible?</p>