Android client stopped working after few days.I had reinstalled it and same happens.
When i press send feedback crash report, it is also crashing and not sending.
Galaxy S20 Ultra, latest K9mail, latest Android 12.
What should i do. Have been using K9mail for a few years… 
When i click icon, fullscreen logo splashscreen apears for 0.5sec and thats all… Even if i stop and start again.
When i clear cache, still not working.
After clear data i can import old config and start using it…
Anybody in same situation?
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Its 11 days from last install without a problem. The difference was that i didn’t allow notification.
So good thing is that K9 is working, but i have no notification D:
As it always crashed on start you were most probably not able to get a debug log.
But maybe with “adb logcat” you could create a crash report and see, why with notifications enabled it crashes.
See here how to use adb logcat with K9
Hope that this will lead to a real solution and not to workaround only 
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K-9 Mail 6.201 fixed a crash when the app was creating a notification but the notification category referenced a non-accessible/non-existing notification sound.
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У меня не работают уведомления при получении почты. Это откючено стстемно или только у меня не работает?
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Please add your question in english - just use an online translator. Also share as much information as possible.
K9 version
Android version
etc
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Oбнови до новой версии, уже все ок.
Update to new version, now its seems ok.