Mail to Comcast is rejected and is returned with an error message containing the code BL001. What does this mean?

You have been blocked from emailing the Comcast network because you are sending email from a dynamic/residential IP address within the Comcast domain.  Comcast does not allow subscribers to send email from a mail server other than 

I don't believe my email is originating from a dynamic/residential source.
Your IP space is designated for residential Comcast service.  You can send or receive email through the Comcast mail servers by using our webmail application or by configuring your mail client to connect properly.  If you need to run your own mail server, please contact our Commercial Services organization at

How do I get my IP removed from the blacklist?
Since you are connecting through Comcast residential IP space, this restriction cannot be lifted at this time.

(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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