[Evolution] easy expunge

[J Black <evolution jblack org>]

Is there a way to easily expunge all my mbox folders?
I have dozens, and it takes too long to control-E and alt-Y on all of
them.

An "expunge all folders" option or "expunge this folder and subfolders"
option would be good, or a command line utility would be just as good
(for me) since I want to do this just before backing up may ~/evolution
folder.

Thanks...
- Jesse