I have no murena/e account added to my device. Webdav/cal through another account.
I wanted to use the mailapp for a non murena/e.email adress but it wasn’t possible to setup because i was only able to choose murena or to import stored settings.
With K9 Mail the setup was easy and successfull.
Thank you very much for your help. In my case i couldn’t see the weiter/next button because i enlarged fontsize. After resizing to default all went fine.