Policy IP Blocklist

An email “Policy” blocklist list all IP addresses that should not be connecting directly to external SMTP servers, but should instead be using their ISP or mail providers’ smart host to relay messages using some form of SMTP authentication.

The list is also designed to preemptively list any IP address that does not appear to be suitable for use with an SMTP server to catch newly compromised hosts, hijacked IP space, etc. immediately without requiring trap hits for listings.

For more see Abusix Mail Intelligence – Policy IP List.

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