I have a mac. Changed the settings per Cox's online instructions, then got an error message "Authentication Required" while trying to send a test message. Chatted with Annie online, she transferred me on the phone to another department. This department told me I have to delete my current account and set it up again. I'm not very savvy when it comes to technology and a friend set up everything for me when I got this mac. So now my choices are: 1) pay extra service fee for Cox Care and they'll come set it up for me, or 2) trouble my friend again to do this for me.
There is a reason why very few people like Cox. We unfortunately live in a town where Cox monopolizes the market and we don't have other alternative.