title: How to check whether I have subscribed successfully to EWS push notification?
body: <p>Now I have subscribed a push notification to EWS to receive Create or New mail events, but sometime I can’t get heartbeat event from EWS more than one hour. </p>
  
  <p>So, if I want to check whether these push notification subscriptions succeed, is there any tool to check it directly? </p>
  
  <p>Thanks in advance!</p>