Free email blacklist checker
Free email blacklist checker for sender domains and IPs
Run a free email blacklist checker to see whether a sender domain or IP address appears on active DNS blacklist zones. Use it during inbox incidents, domain warm-up, or infrastructure changes so blacklist exposure is not discovered after delivery degrades.
Run a free blacklist check
Check sender reputation for a domain or IP
Enter a domain, an IP address, or both. The result summarizes active listings, checked zones, and the addresses actually inspected.