Looks like there may be a few of us in the same boat, I also get the InvalidCosDomain message. It is so frustrating, I want to set up five new e-mail addresses, and to be honest, why
shouldn't I? It's part of the package I pay for. True, if you phone and whinge for an hour, someone will create an e-mail address for you, but that isn't the point for me! I want to do it myself, when I feel like doing it!!!