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Is the Android Protonmail app on F-Droid safe?
(android.izzysoft.de)
There is now an official Protonmail Community at !protonprivacy@lemmy.world
On android there is a tradeoff, either you use googles notification services, or running your own, which will cause battery to die faster. They decided it'n not worth it, and they also don't want to release it without notifications at all, as it seems.
Weird since they apparently thought it was worth it for their VPN app, but not their email client.
VPN app doesn't have to poll server for incoming messages. And, anyway, it is expected to drain your battery when connected