Feature request: counterpart to spam-address.tab (ie. a whitelist)

Hi,
a counterpart to spam-address.tab would be nice,
ie. a whitelist, with precedence over spam-address.tab.
Then one could do such things like that:

spam-address.tab:
"*@baddomain.com"

spam-address-whitelist.tab:
"[email protected]"

Ie. reject all mails from baddomain.com except from [email protected]
(ie. in this case let replies from their abuse address pass thru;
ie. the replies to our complaint mails (abuse reports) sent to them because of spam)

:-)
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