Sorry for the wrong product , but it was the closest thing I could find. Kube installed from flatpak fail to sync my IMAP account at office365. It chokes mid work with "A000015 Bad Command error. 10 .\n Sent Command: ". Steps to reproduce : Install Kube from flatpak: 1. flatpak --user install --from https://kube.kde.org/files/org.kde.kube.flatpakref 2. sudo flatpak remote-add kderuntime --from http://distribute.kde.org/kderuntime.flatpakrepo 3. sudo flatpak install kderuntime org.kde.Sdk 4. flatpak run --devel org.kde.kube Prepare mailbox: 1. Setup an IMAP account on office365 2. put 10 gb of emails in the Inbox folder, make sure to have threads (sent/ reply to the same email etc). Setup an IMAP account on kube (imaps://outlook.office365.com:993/) click on mail icon. It may be related to : https://bugs.kde.org/show_bug.cgi?id=339393 I would have added much more IMAP traces , but kube.kde.org doesn't explain how to do that.
Better to send email directly to maintainer as for sure nobody here will fix it. kube != kdepim so we will not fix it. Sorry Regards