If you are a Spectrum or Time Warner Cable customer and use the ***.rr.com email, you are most likely NOT receiving notifications from the class website. Notifications are sent when a page has been updated or a global email is sent from the web administrator.
If you don't care about the notifications, then you don't have to do anything. You can continue to use your rr.com email as your username.
However, if you do want to receive these notifications, you have two options.
OR...
For additional help with whitelisting email addresses in RoadRunner, please see Road Runner's support.