[MlMt] Move mailbox

[Benny Kjær Nielsen]

How do I move a mailbox to a mail folder? I want to move some
mailboxes that are now at the top level of an account to be under the
"Archive" folder. When I select a mailbox and drag to a folder, it
looks like it moved, but when I let go nothing happens.

There should be visual feedback when dragging which shows whether or not
it can be dropped at the location.

I suggest you update to the latest test release and then contact me via
“Help ▸ Send Feedback” if you still cannot make it work. Hold down
⌥ when clicking “Check Now” in the Software Update preferences
pane to update.