Email Blacklist Checker

Check any IP address or domain against 70+ DNS-based blacklists (RBLs) instantly.

70+ Blacklists IP & Domain Detailed Results

Understanding Email Blacklists

Email blacklists help protect users from spam. Learn how they work and why monitoring your reputation matters for email deliverability.

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What are RBL/DNSBL?

RBL (Realtime Blackhole List) and DNSBL (DNS-based Blacklist) are databases of IP addresses and domains known for sending spam. Email servers query these lists to filter incoming mail.

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Why It Matters

Being blacklisted can prevent your emails from reaching recipients. Mail servers may reject or mark your messages as spam, hurting deliverability rates and damaging your sender reputation.

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How Listing Happens

IPs get blacklisted due to spam complaints, sending to spam traps, compromised servers, poor authentication (SPF/DKIM), or sharing an IP with spammers.

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Major Providers

The most impactful blacklists include Spamhaus (strict criteria), SORBS (spam tracking), SpamCop (user reports), and Barracuda (enterprise security). Being listed on these has significant deliverability impact.

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Getting Delisted

To get delisted: identify the blacklist, visit their website, find their removal process, fix the underlying issue (spam, malware, open relay), then submit a delisting request.

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Prevention Tips

Use SPF, DKIM, and DMARC authentication. Monitor your reputation regularly. Use double opt-in for email lists. Never purchase email lists. Maintain good list hygiene.

Frequently Asked Questions

What is an email blacklist? expand_more

An email blacklist (RBL/DNSBL) is a database of IP addresses and domains known for sending spam or malicious content. Email servers query these lists to filter incoming mail and protect users from unwanted messages.

How do I know if I am blacklisted? expand_more

Use this tool to check your IP address or domain against 70+ major blacklists. If you are listed, the results will show which blacklists have flagged you and may provide reasons for the listing.

Why was my IP/domain blacklisted? expand_more

Common reasons include: sending spam or bulk unsolicited emails, having a compromised server or account, missing or incorrect SPF/DKIM/DMARC records, high bounce rates, spam trap hits, or sharing an IP with spammers.

How do blacklists affect email delivery? expand_more

Being blacklisted can severely impact email deliverability. Mail servers may reject your emails outright, mark them as spam, or delay delivery. This hurts your sender reputation and prevents legitimate emails from reaching recipients.

What is the difference between IP and domain blacklists? expand_more

IP blacklists (RBL) track sending servers by IP address, while domain blacklists (DBL) track domains found in email content or headers. Both are important for email reputation. Always check both your server IP and sending domain.

How do I get removed from a blacklist? expand_more

First, fix the underlying issue (stop spam, secure your server, implement authentication). Then visit the blacklist's website and submit a delisting request. Some blacklists automatically delist after 24-72 hours of clean behavior.

What are SPF, DKIM, and DMARC? expand_more

These are email authentication protocols: SPF (Sender Policy Framework) verifies authorized sending IPs, DKIM (DomainKeys Identified Mail) adds a digital signature, and DMARC specifies handling policies. All help prevent blacklisting.

How often should I check for blacklisting? expand_more

Check weekly if you send regular emails, or daily for high-volume senders. Set up automated monitoring to receive instant alerts when you are blacklisted. Early detection allows faster remediation and minimal impact on deliverability.

Can I prevent being blacklisted? expand_more

Yes. Best practices include: use double opt-in for email lists, never buy email lists, implement SPF/DKIM/DMARC, monitor bounce rates, maintain good list hygiene, use a dedicated IP for sending, and promptly handle abuse complaints.

Are all blacklists equally important? expand_more

No. Major blacklists like Spamhaus, SORBS, and SpamCop are more widely used by email providers. Being listed on these has a bigger impact on deliverability. Smaller or less reputable blacklists may have less strict criteria and fewer consequences.