Recently has been recieving the following message when trying to contact clients
or potential clients who use comcast as an ISP.
When we try to email we receive something like this:

 This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
    SMTP error from remote mail server after MAIL FROM: SIZE=4512:
    host []: 550- blocked by ldap:ou=rblmx,dc=comcast,dc=net
    550 Blocked for abuse.  Please send blacklist removal requests to - Be sure to include your mail server IP ADDRESS.

------ This is a copy of the message, including all the headers. ------

If you're a comcast customer and find you have not heard back from us as quickly as expected
please be have patience as we try to resolve this issue with comcast.

They tend to not be too responsive though. We believe we can still receive inbound emails but there's
no guarantee while issues are being resolved.

Here are some links to other legitimate companies that comcast has beenn problematic for and
some associated online news stories:

Comcast is simply trying to protect clients, yet their technique penalizes hundreds of legitimate
businesses that never send spam or create email abuse of any kind. Actually in attempting to
protect their customers they are penalizing them as well by blocking legitimate business transaction
that occur via email. This ultimately lowers the quality of the internet experience for all
comcast customers (myself included).