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Check if IP or domain is blocklisted

Use tools like MXToolbox to see if an IP or domain is blocklisted. Learn how to check and resolve blocklist issues.

How can I check if an IP address or domain is blocklisted?

You can use external tools like MXToolbox to check if an IP address or domain is blocklisted. These tools will show if the IP or domain appears in any public blocklists.

To do this, extract the source of the email from the ticket, download the EML file, and review the IP addresses and domains. If you find any blocklisted entries, contact the owner to request removal. This process helps ensure your emails are not marked as spam due to blocklisted resources.


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Emails are often marked as spam due to unhealthy resources in the email headers. These headers might contain domains or IP addresses listed in public blocklists, which are used by email filters to identify spam. To address this, you can extract the…

What should I do if my emails are flagged as spam due to blocklisted domains?

If your emails are flagged as spam because of blocklisted domains, you should contact the domain owner to request removal from the blocklist. First, extract the email source from the ticket and download the EML file. Use a text viewer to review the…

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