Email Inbox Error 127.0.0.1

Cox email has been the worst service I've ever experienced.    I have had this error since their security change.    I can't get mail through any other client(iphone, ipad or Outlook) and their web client intermittently allows mail through.    I get "this is a known issue" and it's been around for a long time, we are working on it.   The service technician even said you aren't paying for email service anyway it's free.   I've complained to customer service and they try to sooth you until you realize they are just saying the same thing, they don't know what's wrong and don't know how to fix it and doesn't seem to be a priority.    I so mad at this service I'm tempted to change internet providers.