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Reputation Checker

See whether your domain or sending IP is on the blocklists that decide whether your mail lands or bounces.

  • No signup required — instant result
  • Plain-English issues, warnings, and fixes
  • Optional full report by email
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What this checks

Enter a domain or IP address. We resolve it and query a set of DNS blocklists (DNSBLs/URIBLs) that mailbox providers consult before accepting mail, then summarize where — if anywhere — you're listed, with delisting links.

A note on accuracy: some blocklists (notably Spamhaus) refuse queries from shared public DNS resolvers. Those are shown as “check unavailable” rather than guessed — so you never get a false “clean.” For an authoritative result on those lists, query them directly from your own mail server's IP.

Why it matters

A blocklisting can quietly tank your deliverability — mail bounces or lands in spam with no obvious cause. Catching it early means you can request delisting and fix the underlying issue before it spreads.

More free checks

DMARC Checker

Analyze your DMARC record for policy, reporting, and alignment issues. Get a security grade and the fixes that move it.

SPF Checker

Validate your SPF record, count DNS lookups against the 10-lookup limit, and catch a permissive +all before spammers do.

DKIM Checker

Probe common selectors or check your own. Verify key strength, revocation, and test-mode flags across every signer.

Want this monitored automatically?

A one-time check is a snapshot. Email Watch ingests your DMARC reports daily, flags spoofing the day it appears, and tells you exactly what to fix — free for one domain.

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