I can not sign in to AOL email after upgrading to OS X 10.11 El Capitan

I am regretting :(. After upgrading to El Capitan, I can not log my AOL email into Mail app. Is there any solutions to fix the mail trouble?

My case was Gmail instead of AOL. Attempt to delete you AOL account from System Preference then re-add it again and see the result.

Awesome. It works.