Abusix Mail Intelligence
This list combines all our email blacklists. This is the recommended list to use on most SMTP servers.
This blacklist lists all IP addresses that are unlikely to be used by a legitimate mail server. Legitimate mail servers should use a static IP address with a non-generic PTR record and that reflect the host and domain name of the mail server and ideally should match the forward lookup for the same name (FCrDNS).
It is designed to catch botnet traffic, compromised hosts, hijacked IP space and compute/VPS hosts.
This list is generated by running a reverse DNS lookup for every IPv4 IP address and lists IPs with:
- no PTR record
- PTR record with an invalid top-level domain (TLD)
- PTR record contains part of the IP address (e.g. 127-0-0-1.example.com)
- PTR indicates dynamic IP (e.g. subdomain contains: dynamic, dyn, cable, generic-host, nothing, dsl, dial, dhcp, unallocated, broadband, internetdsl, gprs, no-dns-yet, unassigned, unknown, ipngn, ...)
Any host containing smtp, mail, mx, mta is automatically excluded.