title: how to know email id of whom downloaded the app from Google Play
body: <p>I downloaded an app on Google Play, opened it without any login, and after one day, I received a welcome email from the app team in my inbox. This raised one question in my mind: Is it possible to get the email id of the one who downloaded the app on Google Play? </p>
  
  <p>What I knew: I can only get email id of user from database, when user completes login with detail.</p>
  
  <p>Anyone have any idea how to know email id of whom downloaded the app without login step, please share it.</p>