Email Tools

Blacklist Checker

Check whether a domain, its website server or its mail servers are listed on major spam blacklists such as Spamhaus, SpamCop and Barracuda.

Not sure what to enter? Try an example: github.com

Free & instant No signup How to use FAQ

Enter your domain and we check its website server IP, the IPs of its mail servers and the domain name itself against well-known spam blocklists.

What is an email blacklist?

Email blacklists (DNS blocklists, or DNSBLs) are public lists of IP addresses and domains that have been seen sending spam. Mail providers check them when deciding whether to accept a message, so a listing can send your emails to junk or get them rejected outright. This tool checks your domain and the servers behind it against several widely used lists.

How to check if your domain is blacklisted

Enter your domain, for example example.com, in the box above.
Click Check Blacklists.
Look for any list marked Listed - it shows which IP or the domain is affected.
Fix the cause, then use the removal link next to that list.

Related checks

To make sure your genuine mail is authenticated, run the Email Security Summary.
To see which servers receive your email, use the MX Record Lookup.

A listing usually means something on that server sent spam - a hacked contact form, a compromised mailbox or another customer on shared hosting. Fix the cause first, then use the removal link next to the list; most delist within a day once the problem stops. JustChecker can watch your SPF, DKIM and DMARC records so your genuine mail keeps reaching inboxes.

Frequently Asked Questions

A blocklist (DNSBL) has seen spam or abuse coming from that IP address. Mail servers that use the list may reject or junk email from it. If the listed IP is your website server rather than your mail server, it mostly matters when your site sends email itself - contact forms, order emails and password resets.

Some lists, including Spamhaus and URIBL, refuse queries that arrive through large public DNS resolvers or above a free usage limit. That is not a listing - it only means the answer was not available. You can confirm on the list's own website through the link shown.

First stop the spam: change passwords, clean the infected site or mailbox, and secure open forms. Then open the removal page linked next to the list and request delisting. Several lists, such as SpamCop, remove entries automatically within 24 to 48 hours once no new spam is seen.

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