> ALL mail headers can be forged. Using easily forgeable Received: headers > for validation is useless. True, but can they be forged properly is the question. I've caught enough spam to see that it falls into specific patterns and if I can block half or more of it because it falls into a pattern of having recognizably forged headers then it's a good thing. I'm going to rewrite the function to just contain the IP address checked so that if a machine announces itself as an IP and the IP does not match the actual IP that sent the mail then it's spam. That's good for 10%-15% of the spam right there.
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