OIT System Administrators confirmed today that Comcast blocks inbound email addressed from @umbc.edu.
Many myUMBC account holders prefer to view their email from one account. They use the email forwarding feature to automatically transfer an email sent to their @umbc.edu to @comcast.net. Unfortunately, this forwarding is an all or nothing option which means it also forwards SPAM messages.
This forwarded SPAM has caused UMBC to be blacklisted by Comcast's mail servers. We have been working with Comcast technicians to resolve this issue and will keep the campus posted.