This would be 'Epic'.

Strangely - despite the folders not syncing, sending an email forces the Sent folder to sync with Kube, so you just end up with a Sent folder, and then when you delete you have the Trash folder.

@cmollekopf what is even more strange is that, with a brand new test Fastmail account it does work.

Indeed more bizarrely, Kube only syncs the sent folder, which did not initially sync, because I sent a message using Kube.

Weirdly, eventually data synced up for the Fastmail account after showing disconnected, but then once all is synced it resumes to showing 'disconnected - host not found' for both accounts.

I think operations should be carried out across the thread fully, such that when:

Apologies for lack of clarity.

In my case everything but Kolab Now works. Gmail won't work, nor Fastmail.

After upgrading to the new version, Kube no longer chokes. Everything syncs just fine. We could close this now.

But then delete should move all messages in same folder in the thread to trash

Set up as follows with parameters as suggested above as you have done but there is no option for further settings in Kube (yet)

It's great that actions will be undertaken on threads rather than whole messages.