Cox email has been broken for years, I have spent many hours with a client and mine where the email client is working i.e. Outlook.com, Outlook fat client, or Iphone and then all of the sudden it keeps asking for username and password over and over again, and states that it is incorrect.
After resetting it it will work for a few weeks to a month, and then breaks again.
Also if I just leave it alone for a few hours then it will connect no problems, however this is a Cox issue extending for years now.
Cox techs have said they will call me back with a solution and never have.
I have never had so many issues with emal as with the cox accounts, they are not a once a year issue, this is a week to week or month to month issue many times.