Email blacklist (DNSBL) check
DNS blacklists (DNSBLs) track domains and IP addresses associated with spam. A listing can send legitimate mail straight to the spam folder or block it outright. Enter a domain to check its mail server IPs and its domain against the major blacklists.
Runs the full report, including this check.
Blacklists checked
How the check works
scan.mx queries each blacklist zone for the domain and for the IP addresses of its MX hosts. Only a genuine listing response counts; query errors and rate-limit responses are never reported as a listing. The PBL, which targets direct outbound senders rather than mail servers, is treated as informational for a receiving MX.
Frequently asked questions
My domain is listed. How do I get removed?
Each blacklist runs its own delisting process. Fix the underlying cause first (compromised account, open relay, misconfiguration), then request removal through the operator. See the per-blacklist delisting guides linked above.
Why does a listing hurt deliverability?
Many receiving mail servers consult blacklists during the SMTP conversation. A listed sending IP or domain can be rejected outright or filtered to spam, regardless of how well SPF, DKIM, and DMARC are configured.