DNS Tools Email Blacklist Checker

Email Blacklist Checker

Free email blacklist checker. Check if your IP or domain appears on Spamhaus, Barracuda, SORBS, SpamCop and more.

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Check Email Blacklists

About Email Blacklists

What is a DNSBL?
A DNS-based Blackhole List (DNSBL) is a database of IP addresses known to send spam. Mail servers check these lists before accepting incoming email, if your IP is listed, your messages may be rejected or sent to spam.
Why might I be listed?
Common causes include sending bulk email without proper opt-in, having an open mail relay, malware on your server sending spam, or sharing an IP with a previous bad actor. Fix the root cause before requesting removal.
Email Security
Protect your sending reputation before it is too late.
HostBible Email Security monitors your domain and IP across major blacklists and alerts you the moment a listing appears.
Explore Email Security

Frequently Asked Questions

What is a DNS blacklist (DNSBL)?
A DNS blacklist (DNSBL), also called a Real-time Blackhole List (RBL), is a database of IP addresses or domains known to send spam or engage in abusive behaviour. Mail servers query these lists in real time to decide whether to accept, reject, or flag incoming email. Being listed on a major blacklist such as Spamhaus or Barracuda can cause your email to be blocked or sent to spam at receiving servers worldwide.
Why would my IP address or domain end up on a blacklist?
Common reasons for blacklisting include: sending high volumes of email that recipients report as spam, a compromised server or device on your network sending spam without your knowledge, sending to a spam trap address, having no or misconfigured SPF and DMARC records, or sharing an IP with another sender who has a poor reputation. If you are on a shared hosting plan, another customer on the same IP could also be responsible.
How do I get my IP removed from a blacklist?
The process varies by blacklist. First, identify and fix the underlying cause (spam complaints, a compromised account, a misconfigured server). Then visit the blacklist operator's website and submit a delisting request. The tool shows removal links next to any active listings. Some lists like Spamhaus require a formal request, while others like NiX Spam or SpamCop expire automatically once the spam activity has stopped.
How long does it take to be removed from a blacklist?
Removal times vary widely. Some blacklists such as NiX Spam automatically expire listings after 12 hours of clean behaviour. SpamCop listings typically expire within 24 to 48 hours. Others like Spamhaus may require a manual delisting request and can take several days. UCEPROTECT L1 listings expire after 7 days of clean behaviour, but express removal is available for a fee. Once removed, check again after 24 hours to confirm the delisting has propagated.