Blacklist check
Check whether an IP address is on a mail blacklist, which is usually why email from it stops arriving.
Blacklist
| Blacklist | Result | Response |
|---|
Only lists that answer queries from public resolvers can be checked here. That is a real limit, not a shortcut: the alternative is to report an unanswered query as a clean result, which would be worse than saying nothing.
Getting removed
Each list runs its own removal process, and most have a self-service form. Fix the cause first — an open relay, a compromised account or a bad sending reputation — because a removal without a fix is usually followed by a new listing.
Preguntas frecuentes
Why is Spamhaus shown but not checked?
Because it cannot be checked honestly from a browser. Spamhaus refuses queries arriving through public resolvers such as Cloudflare’s or Google’s, and a browser has no other kind available. It answers with a code in the 127.255.255.x range, which means “not serving you”, not “this address is listed”.
A checker that treats any answer as a hit reports every address on earth as blacklisted. Rather than do that, or quietly drop the most-used list, this tool names it and explains the gap. To check Spamhaus, use a mail server’s own resolver or Spamhaus’s lookup page.
What is a DNSBL?
A blacklist published through DNS. To ask whether 203.0.113.9 is listed, a mail server looks up 9.113.0.203.list.example. An answer means listed; no answer means not listed. It is a quick check a receiving server can make before accepting a message.
My address is listed. What now?
Find the cause before asking for removal. The usual ones are an open relay, a compromised mailbox sending spam, a web form that lets anyone send mail, or a shared address where a neighbour caused it. Once fixed, use the list’s own removal form. Removal without a fix normally leads straight back to a listing, and repeat offenders are delisted more slowly.
Is being on one list a problem?
It depends which. Some are widely used by large mail providers and will stop your mail being delivered. Others are aggressive, little used, or list whole ranges on principle, and matter much less. Check your own mail logs for the rejection message: it usually names the list that actually blocked you.