Originally Posted by dave6x

The Invalidcosdomain error has existed for quite a few months now. I had the same problem trying to add an address 3 months ago. There was a thread running in CF about it a while back but for some reason the thread was closed!!!

If you encounter this error on your account you cannot modify or add email addresses yourself, but CS can on your behalf.

VM seem to be dragging their feet over resolving this fault!!!