Email Reputation Checker
Check whether a domain's mail server appears on common blocklists.
About this check
A domain's sending reputation affects deliverability. If the mail server IP is listed on DNS blocklists (DNSBLs) like Spamhaus or Barracuda, messages may be rejected or sent to spam.
This tool resolves the domain's primary MX, then checks its IP against several public blocklists. Some blocklists refuse queries from shared resolvers, so a "no listings" result is informational rather than a guarantee.
Frequently asked questions
My IP is listed — what now?
Follow each blocklist's delisting process after fixing the root cause (compromise, misconfiguration or spam).
Does a clean result guarantee delivery?
No — reputation is one factor. Proper SPF, DKIM and DMARC alignment also matter.
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