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Email Blacklist Check

Available

Check a mail server IP or domain against well-known DNS-based blocklists (DNSBLs) and see the listing reason where provided.

Email Blacklist Check

Mail server IP or domain

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How it works

The server queries each blocklist using its DNS zone (reversed IP or domain + list zone) and reports listed, not listed, or unavailable for each list — never a guessed result.

Safeguards & responsible use

  • Only public domain names are accepted; internal names (.local, .internal, …) are rejected.
  • Queries go to public resolvers, never to internal DNS.
  • Per-client rate limiting and query timeouts.
  • Only blocklists whose usage terms permit this kind of querying are included; lists that time out are reported as unavailable, not as clean.

Frequently asked questions

My IP is listed — what now?

Fix the cause first (compromised account, open relay, missing rDNS), then follow the delisting procedure on that list’s website.

Does a listing on one list matter?

It depends on the list. Major lists affect delivery widely; minor ones may be used by few receivers.