Version check:
Today UpToDown (which also looks after apps it knows, even it did not install them - I installed K-9 through F-Droid) notified me of an update to K-9, a version 5.503.
I have 5.403. According to version info this should be the latest. Also, F-Droid does not indicated any update. When I click on the update in UpToDown, it does download something. That can also be installed (very fast!) without errors, but after that, it is again displayed as ready for installation.
When I start K-9, it ist 5.403… Is this a malfunction of UpToDown or what? At the moment I do not suspect they tried to force a doctored APK containing malware onto me, because then I think it would not behave as to make me suspicious 