Hello.  I've had a recent request to implement the following on a 
courier server hosting several virtual hosted domains:

1) One of the domains on the server wants to have the incoming email 
only be able to come in from a third-party spam filtering service that 
is acting as the public MX.  I have the IP ranges of that service.

2) From the looks of it my understanding would be this can only be done 
on a server-wide basis using smtpaccess, but not have a specific rule so 
that everything sent to this single domain that is not in that IP range 
gets rejected.  Am I wrong?

3) If my assumption in 2) is correct, my next thought would be to do 
this on a mailbox level using .mailfilter, where the .mailfilter would 
match the received from headers against the IP range and if it failed 
put it in the spam bucket.

Thanks,

Charles Uchu

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