Roadrunner email will not recognize username and password during Mac Mail setup

In trying to resolve a Mac Mail email sending issue I deleted my email address from my Mac Mail account and tried to sign up again. I now can no longer add my roadrunner account to my Mac Mail Account to get started. i.e. I cannot sign in...

Now uninstalling a spam blocker extension...

The problem is resolved!!!

After DAYS of going around with Spectrum and Apple Care to no avail I deleted my ABP(?) spam blocker and a yr 1917 Microsoft app I never used and Voila, the problem is solved!

I’m in!

Not sure yet if I can send mail but at least all my emails are downloading.

[Re-Titled by Moderator]

Original Title: "roadrunner email: when trying to set up my road runner email it will not recognize the user name and password"