I tried to follow all the steps mentioned in ionic service io push notification. After that I sent notification from dashboard of apps dot ionic. But it didn't sent any mail. I don't Know actually what's the reason it isn't responding. May be I am failing to integrate push service into my app.. but in wrote all the codes mentioned in doc into my app.
Regarding pushwoosh the notification works in test device but I don't know how to send notification to all other devices having the app installed.