Sendmail config: whitelist-only for one address?

["Don Levey-7" <user=51@nabble.blu.org>]

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Is anyone aware of a way of configuring sendmail so that mail may only 
be received by a particular address if it's on a whitelist?  I've got 
one specific address on my system which should only receive mail from a 
small list of users (about half a dozen addresses) but one of those 
users must have had their system compromised as the address has now 
gotten out into the wild - with the expected spam explosion.  Ideally 
I'd like to simply reject outright any message that isn't on the 
whitelist for this user, but leave all other users unaffected. 

Has anyone done anything like this?  Is it even possible?  So far I'm 
not finding anything, but people here are more creative than my Google 
searches.  :-) 

 -Don 
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