I'm using fastmail and https://play.google.com/store/apps/details?id=com.onegravity.k10.pro2&hl=en https://play.google.com/store/apps/details?id=com.onegravity.

I'm using fastmail and https://play.google.com/store/apps/details?id=com.onegravity.k10.pro2&hl=en https://play.google.com/store/apps/details?id=com.onegravity... on push notifications, no issues at all. Very happy with it