[MlMt] Undoing an erroneous mailbox type designation

[Steven M. Bellovin]

Somehow -- and how isn't clear to me -- a mailbox was erroneously typed 
as "Sent Messages". I've unchecked that, but I can't get the columns to 
restore to normal. I've tried unchecking 'To', for example, and quitting 
and restarting MM, but it's still there. Any way to fix it? Or should I 
create a new mailbox, copy, and delete/rename?


         --Steve Bellovin, https://www.cs.columbia.edu/~smb