Reply from Comcast

I've gotten this reply before:
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Comcast.net Blocklist Removal Response

Thank you for contacting Comcast Customer Security Assurance. We have received and reviewed your RBL removal request.

Below each IP address you submitted in your request, we have included the result of our research. Please do not reply to this message.

xx.xx.xx.xx

We have received your request for removal from our inbound blocklist. After investigating the issue, we have found that the IP you provided for removal is currently not on our blocklist.

We need the IP address currently blocked to further investigate this issue. The IP address is a number separated by decimals and is located in an error code starting with "550" in the returned email from Comcast. You can learn more about how to identify a blocked IP by visiting our Frequently Asked Question page at :
http://www.comcast.net/help/faq/index.jsp?faq=SecurityMail_Policy18667

Please verify the IP(s) and resubmit your request to http://www.comcastsupport.com/rbl

Sincerely,
Comcast Customer Security Assurance

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Well, if my IP is not in their blasted database, why in hell am I getting those "550" messages referring to that same IP?

Assholes.

Chuck