I recently updated the builtin mail app to version 0.7.10 . After that it stopped working completely.
All I get is a page saying this page is not working, my.domain.com cannot process your request. It is refering to a non https page, also the nextcloud frame (with files, calendar, settings, etc.) dissapears, I have to hit the back button to get it back.
I tried disabling => removing and adding the app again, but it still fails.
I am using the NC13 (RC3?) snap.
Hopefully I can get it back, I really liked the interface. Otherwise: can anyone help installing the other mail app that is not in the app store (tar file) in a snap installation? I cannot find any manual on that.