Domain Blacklist Checker
Enter a domain to check its reputation against well-known blocklists, including DNSBL lists and Spamhaus. Being listed can send your mail straight to spam, so it is worth checking if deliverability has dropped or before a new sending domain goes live.
Want everything at once? Run a full domain report (WHOIS, DNS, SSL, headers, reputation, subdomains).
New to this? Read Domain Reputation Explained: Blocklists, Spam, and Trust.
Frequently asked questions
What lists does this blacklist checker query?
It checks the domain against common URI blocklists (DNSBL) and resolves the domain to an IP to check it against Spamhaus. The result is a reputation score, with any specific listings called out.
My domain is listed. What do I do?
First find and fix the cause, which is usually compromised accounts, a misconfigured mail server, or spammy content. Then request delisting directly from the list that flagged you. Each blocklist runs its own removal process, and delisting before fixing the cause tends to get you relisted.
Why does a clean domain still land in spam?
Blocklists are only one signal. Missing or failing SPF, DKIM and DMARC, poor sending reputation, and spam-like content all hurt deliverability even when you are not listed anywhere. Check your email authentication alongside this.