1. The Password you entered is not correct: This could be due to an error in your password. Remember that passwords can be case sensitive so you need to pay attention when entering your Roadrunner email Login password. When logging into your RR account, make sure you turn off the Caps Lock key.
2. Your RR email account was locked It is possible that your Roadrunner email account was locked for unknown reasons. This issue can be caused by privacy concerns or interruptions in data connections. Before you log in to your RR email, ensure that your network settings are correct. Once the problem is fixed, your RR account will be unlocked.
3. Problems with IMAP and POP servers Another reason for the problem? Roadrunner email login Problems could be caused by incorrect IMAP and POP settings. POP, on the other hand, is intended to save messages to local computers. IMAP is meant to store messages on a mail server. Any issue with the protocols' settings could cause login problems.
4. Your RR account has been suspended Your email account may be suspended permanently if you have not used it for a long time. For assistance, contact Roadrunner customer service.

http://www.email-customer-care.com/roadrunner-support