You have to follow the Roadrunner email settings
Roadrunner Email setup on Android through IMAP & SMTP settings.
Port:993 for IMAP
Insecure Port:143 and Security type: None.
Secure-Port 993 and Security type: SSL/TLS.
Security type: None
Outgoing SMTP secure: Port 465 and security type: SSL/TLS.
If you are unable to do it on your own then you can connect to us, our specialist will help you to fix this issue.