customize index_format for *one* mailbox?

[Hardy Merrill]

I'd like to customize the "index_format" for my "sent" mailbox
to list the "to:" address instead of the "from:" address that
it now displays.  Is this possible to do for just one mailbox?
Maybe with a folder-hook?

TIA.

-- 
Hardy Merrill
Mission Critical Linux, Inc.
http://www.missioncriticallinux.com