Search Third Party Spam Lists

If you sent someone an email, but it was blocked by, that means your IP address or hostname is blacklisted by a third-party blacklisting organization.

To be removed from a blacklist, you will need to contact the blacklisting organization for removal instructions. We provide a list of blacklisting organizations, for your reference, in our control panel.

To search third-party spam blacklists, log into the control panel, and perform the following steps:

  1. In the bounced message that you received, make note of the IP address displayed in brackets. For example, in this sample message, the IP address is
    Client host [] blocked using (in reply to RCPT TO command)

    Note: Sometimes your hostname will also be displayed, along with your IP address.
  2. Click the Support link at the top of the page.
    Support link highlighted.
  3. In the Troubleshoot section, click the Blacklist Lookup link.
  4. In the Search by IP or Hostname box, located in the upper right corner, enter the IP address or hostname you located in Step 1.
  5. Click the Search button.
  6. The organization that has blacklisted your IP or hostname will appear in the list. 
  7. Click the blacklisting organization’s name to visit the organization's website.

Note: It can take up to 24 hours for email systems to recognize that your IP or hostname is no longer blacklisted and to begin delivering your email.