Has this been sorted? This sort of problem is in my experience caused not by you or any of your system settings but a problem with the server that provides your e-mail. It may be that the server is down temporarily. When I get this I first check if the webmail of the account is working. If not I am then sure it is at their end. It can be very frustrating.
I am also having the same problem. I keep getting this message: “Logon to pop.secureserver.net, Please verifies that both the username and password are correct for your mail server”. I have entered my username and password, but it is not letting me access my account.
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