Matthew Seaman wrote:
You need to be very careful implementing something like this.  Most
Spam nowadays is bot-generated and uses forged 'From' addresses culled
from the address books on infected machines.  Unless you're careful,
you're going to end up blocking a lot of completely innocent people,
or worse, blocking your own legitimate e-mail users.

DNS based blacklists are based on the senders IP address, not the forged from address.
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