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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.
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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.

How to Check if Your Domain is Blacklisted

Checking if your domain is blacklisted is a crucial step in maintaining your online reputation. There are several methods to perform this check, ranging from manual lookups to automated tools. Below are some effective ways to verify your domain status:

  • Using Command Line Tools: You can utilize command line tools like dig or nslookup to check DNSBL entries. For example, to check if your domain is listed on Spamhaus, you can reverse your IP and query:
dig +short .zen.spamhaus.org
  • If you receive an IP address in response, your domain is blacklisted.
  • Online Blacklist Checkers: Several online services provide free blacklist checking. Tools like MXToolbox or MultiRBL offer user-friendly interfaces where you can enter your domain or IP address and get an instant report.
  • Manual Checks: You can also manually search each DNSBL to see if your domain is listed. Some popular databases include:
  • Spamhaus
  • URIBL
  • Barracuda

By employing these methods, you can efficiently determine your domain's blacklist status and take necessary actions.

Understanding the Impact of Being Blacklisted

Being blacklisted can have significant repercussions for your online presence. Here are some of the primary impacts:

  • Email Delivery Issues: If your domain is blacklisted, your emails are likely to be marked as spam or rejected entirely. This can lead to loss of communication with customers and potential revenue.
  • Website Accessibility: Browsers and security software may block access to your site, displaying warnings to users. This can deter visitors and harm your site's credibility.
  • SEO Rankings: Search engines may penalize blacklisted domains, leading to lower rankings in search results. This can severely impact your visibility and traffic.

To mitigate these risks, regular monitoring and prompt action are essential. Understanding the implications will help you prioritize maintaining a clean domain status.

Steps to Remove Your Domain from Blacklists

If you discover that your domain has been blacklisted, taking swift action is crucial to restore your reputation. Here are the steps you should follow:

  • Identify the Cause: Before attempting removal, determine why your domain was blacklisted. Common reasons include:
  • Spam complaints from users
  • Malware infections
  • Open relays or misconfigured servers

Address any underlying issues to prevent future occurrences.

  • Request Delisting: Once you have resolved the issues, visit the specific blacklist's website and look for their delisting procedure. Most will have a form or instructions for you to follow.
  • Monitor Your Status: After submitting a delisting request, continue monitoring your domain status using tools like Enterno.io. It may take time for changes to reflect on DNSBLs.
  • Implement Preventative Measures: To avoid future blacklisting, consider:
  • Regularly updating your email practices
  • Using SPF, DKIM, and DMARC records
  • Conducting security audits

By following these steps, you can effectively work towards removing your domain from blacklists and safeguarding your online reputation.

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
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<3s
result
IP
& domain blacklists

How it works

1

Enter domain or IP

2

Checked against 50+ DNSBL lists

3

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

Not configuring SPF recordWithout v=spf1 ... -all anyone can send emails from your domain. This is a guaranteed path to blacklisting.
Ignoring bounce rateA high bounce rate (>2%) signals to ESPs that you're sending to non-existent addresses.
Sending campaigns from the main domainUse a subdomain for marketing campaigns (mail.example.com). Reputation issues won't affect transactional emails.
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

Configure SPF, DKIM and DMARCThis is the basic email authentication. Without it major providers (Gmail, Outlook) mark emails as suspicious.
Warm up new IPsStart with small sending volumes and gradually increase — a sudden spike triggers spam filters.
Monitor reputation regularlyCheck your IP weekly. Many blacklists automatically remove entries after 30-90 days of inactivity.
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.

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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.

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