I use gmail an I am therefore used to tagging mails instead of sorting them into folders (as kmail does/allows).
Is there a way to replicate that in kmail?
This involves 2 things:
a) being able to nest tags;
b) being able to comfortably drag and drop mails to a tree of nested tags.
I know that this is tantamount to asking whether a car can be made to work as a bycicle, but given that Linux is the land of the daring and the bold, I ask it anyhow.

Is that using GMail or any other provider? As far as I can tell, tags in KMail are non-nestable.

Using gmail.
But if there weren't another option, I could rebuild those tags from scratch.

As far as I can tell you can't nest tags. But that doesn't mean it won't be implemented in the future.

I guess I'll just have to wait, then.
Thanks.