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Mail to Comcast is rejected and is returned with an error message containing the code BL002. What does this mean?

You have been blocked from emailing the Comcast network because you are sending email from dynamic/residential IP space.  Comcast does not allow residential / dynamic IP addresses to directly connect to our mail servers.  You must send your email to Comcast customers through your provider??s mail server.  

How do you determine my internet connection is dynamic/residential?
Comcast has worked with your mail provider to confirm the IP space you are connecting through is not permitted.  In addition, Comcast examines the reverse DNS of the connecting server and will identify the mail server as residential/dynamic, if it does not comply with standard static naming conventions.

I don??t believe my email is originating from a dynamic/residential source.
Comcast has taken steps to reduce the potential for incorrectly identifying a residential IP address, including working with many Internet Service Providers (ISPs) and email providers who offered their dynamic range to be blocked.  However, if you feel you are connecting from a static and/or non-residential IP address, you should contact your email provider to identify the configuration changes that can be made so you can connect to Comcast.  If your mail administrator confirms your internet connection is being hosted as a static and/or non-residential IP address, you should contact your email provider to identify the configuration changes that can be made so you can connect to Comcast.  If your mail administrator confirms your internet connection is being hosted as a static and/or non-residential IP address, you should request your mail administrator update the reverse DNS of your internet connection to reflect a static connection. 

 

I believe that I am connecting through a dynamic/residential internet connection, but it has worked in the past.

Comcast continues to update our anti-spam rules to ensure the best possible email experience for our users.   By connecting through a residential internet connection, you are increasing the chances that your IP may be blocked.   Comcast strongly encourages you to migrate your email distribution through a non-residential internet connection.

 

I/My email provider have taken the steps outlined in this document, how do I get my IP removed from the blacklist?

To be considered for removal, please ask your email provider to send a request to blacklist_comcastnet@cable.comcast.com .  Please note: If there is a history of repeated blocks, Comcast will deny the removal request and advise that your email provider contact Comcast to address the issue. Also, when submitting a request,  please be sure to include the specific IP you believed to be blocked (the IP was returned in the 550 error message which contained the link to this FAQ).  Requests which do not contain an IP address, or which contain many IP addresses, will be rejected.   Requests are processed within 24 hours of receipt.


 

(The above information was originally published on Comcast's support site and was added to our KnowledgeBase on September 02, 2006 for the benefit of our customers)



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