Tools / Blacklist check

Blacklist & reputation check

Checks a domain and its resolved IP addresses against supported mail-reputation blocklists, plus a threat-intelligence DNS resolver.

Lists checked

Domain: Spamhaus DBL, SURBL, URIBL.
IP (each A record): Spamhaus ZEN, Barracuda Reputation Block List.
Threat resolver: whether Quad9 refuses to resolve the name while Cloudflare still does — a sign it is on threat-intelligence feeds.

Caveat

Public DNSBLs rate-limit or refuse queries from datacenter resolvers. A “not listed” result here means “not visible from this server”, not a clean bill of health. For a definitive check, query from the sending mail server itself.