> the visible permanent notification about PUSH You definitely didn't read why that notification exists. This is required to allow (somewhat*) reliable backgro

> the visible permanent notification about PUSH You definitely didn't read why that notification exists. This is required to allow (somewhat*) reliable background activity in Android 6.0+, and if you're using Android 9+ you can hide it (unfortunately Android 8.1 and below don't support fine-grained notification management). The other option is to rely on Firebase mobile push (previously GCM pushes), but that would require something else to read and push messages to Google. * Unfortunately, most Android phones bundle aggressive power management "features" that will kill K9 (or any app really) if you didn't whitelist them. You should probably read Don't Kill My App (https://dontkillmyapp.com https://dontkillmyapp.com) to learn how to disable this, assuming that your phone allows them.