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Check a Domain or IP Against Blacklists

Find out whether your mail server or domain is on a list that's blocking your email.

Enter a domain to check the domain lists and your mail servers, or an IP to check that server's reputation directly.

How to use it

  1. Enter your domain name, or your mail server's IP address.
  2. Press Check and wait a few seconds — several lists are queried at once.
  3. Review the results: green means not listed, red means listed along with the reason.
  4. Follow the list's link to request removal, once you've dealt with the cause.

When your messages stop reaching recipients for no obvious reason, a blacklist entry is one of the most common causes. Mail providers use these lists to reject messages from known spam sources, and your server can be added without you ever being notified.

There are two different kinds of list: IP lists, which score the reputation of the sending server, and domain lists, which track domains appearing inside spam. If you enter a domain we check it against the domain lists, then resolve its MX records and check the mail servers' addresses too — because rejection is decided by the sending server's IP, not by the domain name.

Being listed is a symptom, not the problem itself. In most cases it means the server has been compromised and is sending spam, an account's credentials were stolen, or a mailing list went to addresses that never opted in. Fix the cause first — requesting removal before you do will simply get you relisted within days.

Frequently asked questions

Either works. Entering an IP checks that server's reputation directly, which is the most precise option if you run your own mail server. Entering a domain checks the domain lists and then resolves your mail servers and checks their addresses too.

It means the list didn't answer, or refused the query — it is not a listing. Some lists, Spamhaus among them, refuse queries arriving through public DNS resolvers. We show that as its own state rather than counting it as a listing, because conflating the two produces an alarming and wrong answer.

Deal with the cause first: close whatever was exploited, change compromised passwords, and stop any unauthorised bulk sending. Then use the list's link to file a removal request. Some lists expire an entry automatically once the activity stops.

It depends which one. A Spamhaus or Barracuda listing affects deliverability broadly because so many servers consult them. Smaller or more aggressive lists have far narrower impact. Look at the stated reason before worrying.