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Where to get ProtonMail
(lemmy.zip)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
Matrix space | forum | IRC
Currently, yes. But they are working on they're own notification systems (probably something based on WebSocket, similar to what Signal does), hopefully it will also be compatible with UnifiedPush. There's a feature request for this on the Proton user feedback tracker: https://protonmail.uservoice.com/forums/284483-proton-mail/suggestions/47423924-support-unifiedpush-for-android-notifications
they have been working on it for years, as I remember. In the meantime they have released half a dozen software that I believe are more complex than a simple notification system.