DNSBL

DNSBL (aka Domain Name System Blackhole List, Domain Name System Blacklist, RBL, Real-time Blackhole list) uses DNS as a database lookup to a reputation provider (either as a blocklist or allow list), such as Abusix Mail Intelligence, to determine the trustworthiness of an IP, domain name, and hashed value (like a URL or file).

DNSBL functions and operations are defined by RFC5782.

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Please use our lookup-service and follow the instructions there in order to get that resolved.