title: Is it possible to get a delivery receipt for a remote Push Notification at the time of delivery?
body: <p>If a phone has turned off receipt of remote push notifications, or a push notification fails to be delivered, can the originator of the push get informed that it failed to be delivered?</p>
  
  <p>I know there is the feedback service available to query for failed delivery attempts, but that sounds like its a pull type feedback rather than something like a receipt sent for every push notification.</p>
  
  <p>So suppose we sent push notifications to 100,000 devices, could we then connect to the feedback service and see which ones failed? How accurate is this, is there a time delay before feedback info is available?</p>