title: http status code for failed email send
body: <p>Consider an API call that creates a user.  On success, the user is created and a confirmation email is sent.  The response status code is 201.  </p>
  
  <p>If the user is not created, the response status code is 422.  </p>
  
  <p>What should the response status code be if user is created BUT sending the confirmation email failed?  </p>