Free Toolkit
Email Blacklist Checker
Check your sending domain or IP against 27 major blacklists in seconds. Results are fetched live — no caching, no signup.
27 Blacklists
Covers all major IP and domain blacklists used by Gmail, Outlook, Yahoo, and enterprise mail filters.
Live DNS Lookup
Each check queries the blacklist directly via DNS — the same method mail servers use. No cached data.
Instant Results
All checks run in parallel. Most complete within 3–5 seconds. Results stream in as they finish.
Want continuous blacklist monitoring?
Mailflo monitors all your sending domains around the clock and alerts you the moment a listing appears — before it affects your campaigns.
See Mailflo plans