How to upgrade from 5.600 to 5.7xx without losing mails?

[ByteHamster]

@LEECH666

My guess is, that there are no beta versions on the Play Store

There are beta versions on the play store. Have a look at the following topic for details:

How do I become a beta tester?

Get the beta version You can download a beta version of the app via these channels: GitHub releases We publish all of our releases there. Beta versions are marked with a “Pre-release” label. Play Store You should be able to join the beta program using the Google Play Store app on the device. Look out for the “Join the beta” section in K-9 Mail’s detail page. F-Droid Unlike stable versions, beta versions on F-Droid are not marked with a “Suggested” label. You have to manually select suc…

@LEECH666

However I am having problems with push notifications, or to be more precise any notifications by K9

While push notifications no longer work in 5.7xx, checking emails periodically should work.