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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
I overall trust APKs from IzzySoft as those are just fetched official releases compiled by app developers themselves. You can verify that yourself by downloading older version APK from ProtonMail GitHub repo then updating the app through F-Droid. If it updates then it means that the APK from GitHub and APK from F-Droid are signed with the same key.
Another way would be to use something like Obtainium to track new releases on the official ProtonMail repo.