I resent the message after reading your posts and retried the e-mail.
It looks like it went through this time. (so far)
Here is what I was getting for 2 days. (I x'ed out the persons name in the email)
The original message was received at Tue, 23 Jul 2013 15:00:30 GMT
from d-69-161-73-112.cpe.metrocast.net [69.161.73.112]
----- The following addresses had permanent fatal errors -----
(reason: 550 OU-002 (COL0-MC1-F47) Unfortunately, messages from 65.175.128.136 weren't sent. Please contact y...ock list. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors.)
----- Transcript of session follows -----
... while talking to mx2.hotmail.com.:
>>> MAIL From: SIZE=357768
<<< 550 OU-002 (COL0-MC1-F47) Unfortunately, messages from 65.175.128.136 weren't sent. Please contact your Internet service provider since part of their network is on our block list. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors.
554 5.0.0 Service unavailable
Metrocast told me that they were talking to gmail, hotmail, AOL etc because they had "shut off" all email from any metrocast account to their account holders, because someone was spamming using a series of metrocast email account.