I had the same problem today. Called tech support. First lady was nice but could not help. Was turned over to a tier two tech. This bi%$h was the rudest person I have EVER had to deal with at Cox! They changed my password and I had to fix that issue on my phone and my computer. Was told it was my fault not Cox's!!!!! It had worked fine this morning and then when I came home around 11:00 this morning I was getting that same message.
I am getting really tired of Cox telling me if I don't like what is happening with me email I should just change email providers. That would be a lot of changes on my end that I don't feel I should have to make. This is Cox's problem and as someone else pointed out you would think a company as big as Cox could fix these issues!