Blacklist Check
Check any domain or sending IP against 25+ blacklists including Spamhaus - queried from our own resolver, so the results are accurate. Free, no login.
Free email blacklist check, done properly
A blacklist check tells you whether your domain or sending IP appears on a DNSBL - a published list of addresses reported for sending spam. Mail receivers consult these lists on every message, so a single listing on a major blacklist like Spamhaus can send your legitimate mail straight to spam or get it rejected outright. This tool checks any domain or IP against 25+ of the blacklists that matter, and gives you a plain-English reason and a delisting link for every hit.
Why our results are accurate
Spamhaus, Barracuda, SORBS and others refuse queries from large public resolvers like Google and Cloudflare - they return an error that most free tools misread as "not listed." We query from our own dedicated resolver, so these lists answer correctly and you get the real picture, not a false all-clear.
Domain or IP - we check both
Enter a domain and we resolve the IPs behind its A record and its mail servers, then check each one. Enter a sending IP and we check it directly. Listings usually attach to the sending IP, so if you run your own mail server, check its IP.
25+ blacklists, weighted by impact
We check Spamhaus ZEN, Barracuda, SpamCop, SORBS, UCEPROTECT, CBL, Mailspike and more - and flag which listings actually hurt deliverability versus which are minor, so you know what to fix first.
A delisting link for every hit
Each listing comes with a direct link to that blacklist's removal process. Fix the underlying cause first - a compromised account, poor list hygiene or a complaint spike - because most lists re-list you if the problem persists.
Frequently asked questions
What is a DNS blacklist (DNSBL)?
A DNS blacklist, or DNSBL, is a published list of IP addresses reported for sending spam or malicious mail. Mail receivers check sending IPs against these lists and may reject, quarantine or penalise mail from listed IPs. Spamhaus ZEN is the most consequential for deliverability.
Why do other blacklist checkers show wrong results for Spamhaus?
Spamhaus and several other blacklists refuse queries that come from large public DNS resolvers such as Google and Cloudflare, returning an error code instead of a real answer. Tools that rely on those public resolvers misread the error and report a domain as not listed when it may be. This checker queries from its own dedicated resolver, so Spamhaus answers correctly.
Should I check my domain or my IP address?
Both are useful. Entering a domain checks the IPs behind its A record and its mail servers. Entering a sending IP checks that address directly. Blacklistings usually attach to the sending IP, so if you run your own mail server, check its IP.
My IP is blacklisted. How do I get removed?
Each blacklist has its own delisting process, linked next to every listing in this tool. First fix the underlying cause - a compromised account, an open relay, poor list hygiene or a spam complaint spike - because most lists will re-list you if the problem persists. For persistent or business-critical listings, professional help speeds recovery.
Listed somewhere and need it cleared fast?
Blacklist recovery is one of our core services. Postbox Consultancy Services has delisted domains and IPs and fixed the root cause for 500+ clients over 10+ years - so it stays fixed.