If you want your Android smartphone to set up RoadRunner email settings, it can be hard to get it to function. Some individuals gave up their RoadRunner email and just set it up to operate through Gmail. However, you can get it to work with the Android Email app directly. This means you don't need to use the webmail interface of Rr.com! You can use other mail services (such as Mailspring, Outlook Express, Apple Mail, or Mozilla Thunderbird) to verify your mail and submit emails. You can enhance your workflow by using desktop email apps.
Reference Link: https://www.roadrunneremail-login.com/blog/roadrunner-email-settings-for-iphone/