@ChristophWurst I sincerely apologize for using the word ‘crap’. It is not fair to you that I express my and our users emotions in that way. So sorry for that.
For now I will disable mail for our users and let them use another (separate) client which luckily is still there. Also I will contact my subscription representative to see what apps we should see as critical for our organisation.
In general I am worried with the pace Nextcloud is developing. With the enormous high rate of updates on the core and apps it is not only for you as a developer but also for me as a implementer and user absolutely impossible to deliver a technical and functional stable platform. Especially when, in this case, new features are presented which we are forced to use and have a lot of bugs (which is normal for new features btw.)
So again, sorry for the offence but I also hope you “feel” a little bit of our frustration.