Spam & Blacklist Check

If your domain or IP address appears in spam databases, emails won't reach recipients and your site may be blocked by browsers and antivirus software. Enterno.io checks your domain against dozens of DNSBL and spam lists, showing your exact status in each one.

Try it now — free →

What Are DNSBL Blacklists

DNSBL (DNS-based Blackhole Lists) are databases of IP addresses and domains known for sending spam or malicious activity. Mail servers check incoming messages against these lists.

Spamhaus (SBL, XBL, DBL)
Barracuda Reputation Block List
SURBL and URIBL
MXToolbox, SORBS and others

How Domains End Up on Blacklists

Common reasons for blacklisting:

Compromised site was used to send spam
Server was used for phishing
Bulk email sent without consent
High complaint rates from recipients
Purchasing a domain with a poor prior reputation

What to Do If You're Blacklisted

If listed: 1) Remove the root cause (clean the site, change compromised passwords). 2) Submit a delisting request through the specific DNSBL's form. 3) Recheck after 24-48 hours.

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

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

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

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

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.

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Multi-blacklist check

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

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IP and Domain

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

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Delisting Instructions

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

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Check History

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

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.

Frequently Asked Questions

How do I check if my domain is blacklisted?

Enter your domain or IP into the form above. Enterno.io will check it against all major DNSBL and spam lists and display your status in each one.

Why are my emails going to spam?

Common causes: domain on blacklists, missing SPF/DKIM/DMARC records, high complaint rates, or sending to invalid addresses. Start with a blacklist check.

How do I remove my domain from a blacklist?

Each DNSBL has its own delisting procedure. Typically you fill out a form on the DNSBL's site, explain the issue, and describe corrective actions. Review takes 1-7 days.

Is the check free?

Yes, checking your domain and IP against spam databases is completely free and requires no registration.