Email Blacklist Check

What this tool does

Blacklists (DNSBL or RBL) are databases of IP addresses that have sent spam, are infected or have a suspicious setup. Mail servers around the world check these lists before accepting a message. This tool checks the IP you enter against well-known lists, including the Brazilian SPFBL.

How to read the result

• Clean: the IP is not on that list.
• Listed: the IP is on the list. Messages sent from that IP may be rejected by servers that use the list.
• Query refused: the list doesn't accept queries from public resolvers or requires registration. It doesn't mean the IP is listed.

The IP is listed. Now what?

1. Find the cause: a hacked email account, a website form sending spam, an infected computer or unauthorized bulk mailing.
2. Fix the cause before requesting removal. Asking for removal without fixing it puts the IP right back on the list.
3. Check the reverse DNS and the domain's SPF, DKIM and DMARC records with the DNS lookup.
4. Request removal on each list's website. Many delist automatically after a few days without spam.

Frequently asked questions

Why is my IP on a blacklist?

Usually because spam was sent from it: a hacked account, a website with an exploited form or an infected machine. On home and cloud connections, the IP may have been listed because of a previous user.

How do I get my IP off a blacklist?

Fix the cause and then request removal on the list's website. Some remove it automatically after a period with no new reports.

Is being on a small list serious?

It depends on who uses the list. Spamhaus and Barracuda have a big impact. Smaller lists affect few servers.

Does the tool check domains?

Enter your mail server's domain and we check the IP it points to. Domain lists, known as URIBLs, are not checked here.