Scam-grey is a milter that filters email
originating from MS Windows hosts. It provides you
the ability to mitigate the flow of unwanted email
from such hosts using greylisting.
License: BSD License (revised)
Changes:
There is a new feature to greylist if the sender address and remote host are not from the same country. A bug in saving the cache on some operating systems has been fixed. The default configuration includes all ASNs from China for greylisting.