I emailed comcast about this is this is what they said, I don't think I've heard anything about cathenation.com doing anything about this:
Thank you for contacting Comcast Cable.
After reviewing your email, it appears as though there might be an issue
with blocked email. To ensure correct handling of this issue, the mail
administrator for the sending domain will need to visit the following
address and submit a "Blocked Provider Request Form":
http://www.comcastsupport.com/rbl
Customer Security Assurance cannot address blacklist issues from
individual customers.
When submitting the form, suggest the mail administrator include a copy
of the email header, as well as the mail server names. The sender will
want to review the error message provided with the bounce back message
from Comcast to help identify the blocked IP address, which will be
located in an error code starting with "550." Have the mail
administrator include each IP address currently blocked so we can fully
investigate the issue. You can learn more about how to identify a
blocked IP by visiting the following page:
http://www.comcast.net/help/faq/inde...il_Policy18667
Also, the following links will provide additional information helpful to
resolving issues when a blocked IP sends email to the Comcast.net
domain:
BL001
http://www.comcast.net/help/faq/inde...il_Policy18625
BL002
http://www.comcast.net/help/faq/inde...il_Policy18626
BL003
http://www.comcast.net/help/faq/inde...il_Policy18627
BL004
http://www.comcast.net/help/faq/inde...il_Policy18628
Please note that Comcast is not blocking individual senders, but only
mail servers that have sent high volumes of spam to the Comcast.net
domain.
We will be the company to look to first for the communications products
and services that connect people to what's important in their lives.
Thank you for choosing Comcast.