How the blacklist check works
Blacklists (also called DNSBLs or RBLs) are lists of IP addresses and domains that have sent spam or look compromised. Mail servers query them for every incoming message. If your IP is listed, your emails bounce or go straight to spam.
Enter your domain and we look up its MX records, find the IP address of your mail server and website, and query each one against more than 45 IP blacklists at the same time. The domain itself is also checked against domain blacklists such as Spamhaus DBL, SURBL and URIBL, which matter for links inside your emails.
What to do if you are listed
- Find the cause. A hacked mailbox or website sending spam, an open relay, missing reverse DNS, or a shared IP that someone else abused.
- Fix it first. Change passwords, remove malware, close the relay, set reverse DNS. Delisting before fixing just gets you listed again.
- Request removal. Most major lists (Spamhaus, SpamCop, Barracuda) have a self-service removal page, and many expire listings automatically once spam stops.
- Re-check here after the removal is confirmed.
Listed on a website IP only?
If the listed IP only hosts your website and not your mail, email is usually unaffected, but it can hint that the server or a neighbour on shared hosting is sending spam. We mark these as warnings, not errors.