Question about disabling greylisting on a virtuser address

Is there anyway with the new greylist disable option to disable it for
a virtuser entry like:

foo@domain.com: foo@yahoo.com

where "domain.com" is MX'ed to the server doing greylisting.  There
isn't a local account involved, is there a place for a "whiteclnt" file
for the address somewhere?

Thanks,

->Spike