🔒 Spam Blacklist Check

Check an IP or domain against 20 DNSBL blacklists: Spamhaus, SpamCop, SORBS and more

TL;DR:

Blacklist checker tests an IP or domain against 30+ public DNSBLs (Spamhaus, Barracuda, SORBS, SpamCop, UCEPROTECT). Shows which lists the target is on and why. Fast answer to "why does my mail end up in spam".

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DNSBL CheckWe check IP and domain against dozens of DNS blacklists: Spamhaus, Barracuda, SORBS and others.

DeliverabilityBeing blacklisted means your emails go to SPAM or are rejected at the mail server level.

SPF / DKIM / DMARCConfiguring email authentication reduces spam score and dramatically improves deliverability.

Sender ReputationIP reputation is built by sending history — complaints and bounces reduce it instantly.

Why teams trust us

50+

DNSBL databases

SPF

DKIM & DMARC

<3s

result

& domain blacklists

How it works

Enter domain or IP

Checked against 50+ DNSBL lists

Blacklists & SPF/DMARC result

Email spam check: protect your email deliverability

Being on a spam blacklist critically reduces email deliverability. The tool checks your server against major blacklist databases and provides delisting instructions.

Multi-blacklist check

Simultaneous check against Spamhaus, Barracuda, SURBL, URIBL, Invaluement and other databases.

IP and Domain

Check both the server IP address and the sender domain — both affect deliverability.

Delisting Instructions

For each blacklist we show a direct link to the delisting form and processing timeframes.

Check History

Save check results to track the dynamics of IP reputation over time.

Who uses this

Email marketers

email deliverability

Sysadmins

mail server reputation

Security

IP blacklist check

Developers

SMTP config verification

Common Mistakes

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Not configuring SPF recordWithout v=spf1 ... -all anyone can send emails from your domain. This is a guaranteed path to blacklisting.

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Ignoring bounce rateA high bounce rate (>2%) signals to ESPs that you're sending to non-existent addresses.

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Sending campaigns from the main domainUse a subdomain for marketing campaigns (mail.example.com). Reputation issues won't affect transactional emails.

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Not checking the IP of a new serverA new VPS may have a blacklisted IP — the previous tenant may have used it for spam.

Best Practices

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Configure SPF, DKIM and DMARCThis is the basic email authentication. Without it major providers (Gmail, Outlook) mark emails as suspicious.

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Warm up new IPsStart with small sending volumes and gradually increase — a sudden spike triggers spam filters.

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Monitor reputation regularlyCheck your IP weekly. Many blacklists automatically remove entries after 30-90 days of inactivity.

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Configure PTR record (rDNS)The reverse DNS record for your IP must match the server hostname. Its absence is a red flag for spam filters.

Get more with a free account

Spam check history and reputation monitoring for your domain and IP.

DNSBL Blacklist Check — Is Your IP Blacklisted?

DNSBL (DNS-based Blackhole Lists) are real-time spam databases used by mail servers to block unwanted email. Being listed on a blacklist can severely impact your email deliverability and server reputation. Our tool checks your IP or domain against 20 major blacklists including Spamhaus, SpamCop, SORBS, Barracuda Central, and more.

If your IP is listed, use the delisting links provided to request removal from each blacklist. Common reasons for blacklisting include sending spam, running an open relay, or being part of a botnet. After delisting, use our DNS Lookup to verify your server's MX records and SSL Checker to ensure your mail server certificate is valid.

Frequently Asked Questions

What is DNSBL?

DNSBL (DNS-based Blackhole List) is a list of IP addresses reported for spam. We check 20+ such lists.

My IP is on a spam list. What do I do?

Contact the DNSBL owner for delisting. Usually you need to fix the cause (open relay, compromised server) and submit a request.

Related guides

Longer-form reading on this topic from the knowledge base.

Email deliverability monitoring

Alerts on MX / SPF / DKIM / DMARC changes — guard against silent email infrastructure breakage.

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