Free Domain Blacklist Checker

Check if your domain is blacklisted and protect your email deliverability with a free domain blacklist checker.

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What is a domain blacklist checker?

A domain blacklist checker is a tool designed to help you identify if your domain has been flagged for suspicious or harmful activities, such as sending spam emails or hosting malicious content. If your domain appears in an email blacklist database, it will affect your domain’s email deliverability and online reputation.

How does a domain blacklist checker work?

A domain blacklist checker operates by performing the following steps in real-time:

  1. DNS lookups: The tool queries Domain Name System (DNS) servers to retrieve details about your domain.

  2. Database comparison: It cross-references your domain against known blacklist databases, such as Spamhaus or Barracuda.

  3. Blacklist status report: The tool provides a detailed report indicating whether your domain appears on any blacklist and, if so, which ones.

Why should you use a domain blacklist lookup tool?

A domain blacklist lookup tool is essential for the following:

  1. Email deliverability: Ensuring emails from your domain aren’t marked as spam or blocked.

  2. Brand reputation: Maintaining trust with your audience by keeping your domain and email server free of blacklists.

How to fix issues detected by a domain blacklist check tool?

If your domain is flagged as blacklisted, take the following steps:

  1. Identify the blacklist: Determine which database has flagged your domain using the checker’s report.

  2. Investigate the cause: Look for reasons like sending spam, compromised servers, or malicious activities like phishing.

  3. Resolve the issue: Secure your server, update software, remove malware, adjust email-sending practices, or add email address validation to prevent getting caught by spam traps.

  4. Request delisting: Contact the blacklist administrators for a removal request and provide evidence that the issue has been fixed.

  5. Monitor regularly: Conduct periodic checks to ensure your domain remains clean.

Mailtrap Tip

If unauthorized emails are being sent from your domain, consider adding a stricter policy (e.g., -all instead of ~all) to your SPF record and combining it with a DMARC record for enhanced protection.

FAQ

What is a domain blacklist?

A domain blacklist is a database of domains identified as sending spam or hosting harmful content. The organizations that protect users from online threats maintain the database.

What is email domain reputation?

Email domain reputation is a measure of how email providers perceive your domain’s email-sending behavior. A positive reputation ensures emails land in inboxes, while a negative one increases the likelihood of spam filtering.

How to check if a domain is blacklisted?

You can use a domain blacklist checker to scan multiple databases and identify if your domain is flagged. Simply enter your domain into the tool, and it will return the blacklist status.

How long does a domain blacklist last?

The duration varies depending on the terms set forth by the blacklist. Some remove domains automatically after a set period, while others require manual requests for delisting.

How to solve domain blacklist issues?

To solve domain blacklist issues, start by identifying the blacklist your domain is listed on and investigating the underlying cause, which could include spam complaints or security breaches. Once you understand the problem, take steps to resolve it, such as securing your server, removing malware, or improving your email-sending practices to ensure compliance with industry standards. After addressing the root cause, request delisting by reaching out to the relevant blacklist administrators and providing evidence of the corrective actions you have taken to resolve the issue and prevent it from recurring.

What is the difference between IP and domain blacklist?

The IP blacklist targets specific IP addresses associated with harmful activities. Whereas domain blacklist flags domain names, often used in email headers or links, for malicious behavior. The impact is that both can reduce email deliverability and block access to websites.

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