Mail Blacklist Checker
Free Mail Server Blacklist Checker
Checks your domain's mail server IP against Spamhaus, Barracuda, Spamcop, SORBS, UCEProtect and CBL — the major public DNS blocklists — live.
Mail Blacklist Checker
Checks your mail server's IP against Spamhaus, Barracuda, Spamcop, SORBS, UCEProtect and CBL.
Enter a domain above to run a real, live check.
Capabilities
What it checks
6 blocklists
Spamhaus ZEN, Barracuda, Spamcop, SORBS, UCEProtect and CBL.
Mail server focused
Checks your MX host's IP specifically, not your website's.
Clear status
Listed, clean, or inconclusive when a list can't be queried publicly.
Why use it
Benefits
- Diagnose why outbound mail from your domain is being rejected or flagged as spam.
- Verify a delisting request actually took effect.
- Export results as JSON for an incident report.
FAQ
Frequently Asked Questions
Spamhaus, Barracuda, Spamcop, SORBS, UCEProtect and the Composite Blocking List — ProofPoint doesn't operate a public DNSBL, so CBL is used in its place.