title: Get user email in windows 10 universal app
body: <p>I am trying to build a control that the user can use to send feedback to developer. I am using email as a delivery method and I leverage sendgrid email service for this. Now I want to know the users email address so I can respond back to the user's concern. I am not sure how to get the user's email in window 10. Any help or pointers please?</p>