I am having the same issue. I use Mozilla Thunderbird as my email client, which reports the error "Sending of password did not succeed. Mail server pop.cox.net responded: account is inactive". Logging into myemail.cox.net shows that the account is indeed still active and receiving mail, I'm just not able to access it through Thunderbird. I have attempted to access the account from multiple devices with the same result. I manage multiple Cox email addresses from the same Thunderbird installation and all of my other accounts work just fine using the same server settings: pop.cox.net, SSL/TLS, port 995.