Blacklist Check
Free blacklist check against 25+ DNSBLs including Spamhaus. Check any domain or sending IP, with a delisting link for every hit. Queried from our own resolver.
About the Blacklist Check
Check whether your domain or sending IP is on an email blacklist. Our blacklist checker queries 25+ DNSBLs including Spamhaus ZEN, Barracuda and SpamCop - from our own dedicated resolver, so the results are accurate. Most free tools query via public resolvers that Spamhaus refuses, giving false results.
This tool runs on its own dedicated page for speed and accuracy.
Frequently asked questions
What is a DNS blacklist?
A DNS blacklist (DNSBL) is a published list of IP addresses reported for sending spam. Mail receivers check sending IPs against these lists and may reject or penalise listed mail. Spamhaus is the most consequential for deliverability.
Why do other blacklist checkers show wrong results?
Spamhaus and others refuse queries from public resolvers like Google and Cloudflare, returning an error most tools misread as 'not listed'. Our checker uses its own resolver so those lists answer correctly.
How do I get delisted?
Fix the root cause first - a compromised account, open relay, or bad list - then use the delisting link shown for each listing. Requesting removal without fixing the cause usually leads to re-listing.
Did this check reveal a problem?
Postbox Consultancy Services fixes email deliverability for a living - 500+ clients over 10+ years. Authentication, blacklist recovery, cold email infrastructure and full audits.