Blacklist Check
Type an IP or a domain. We ask the lists that mail servers really consult, and say exactly what each one answered.
Why it matters which list
Not all lists weigh the same. A handful are consulted by most mail servers and getting on one of them stops your mail today; the rest are read by almost nobody. Telling you “listed” without saying where turns a five-minute fix into a week of guessing.
What this does not tell you
One look, right now. A clean address can be listed tomorrow and the lists do not warn you — nobody gets an email saying “you are on it”. And being clean here does not mean your mail arrives: that is what Mail Doctor and Mail Tester are for.
If you are here, this is usually what comes next
Want to be told, instead of asking
This is a one-off look. Checking it every few minutes and telling you the day it gets listed is what monitoring does.
Frequently asked questions
- Why is my IP on a blacklist?
- Almost always because mail that looked like spam left that address: a mailbox someone got into, a form anyone can send from, or a neighbour on a shared IP. The list doesn’t say which of the three — it says that it happened.
- How do I get off one?
- Each list has its own form, and they all ask the same thing first: that whatever was sending has stopped. Getting removed without fixing the cause puts you back on within days.
- Which lists actually matter?
- The handful that mail servers really query, Spamhaus ahead of the rest. Being on one of those stops your mail today; being on an obscure one may change nothing — which is why this says which list, and not just that you are on one.