Thanks for getting back to me. Since I posted this post. My default email has started to work again, but all my old emails which were on the virginmedia server have vanished? I access my mail through Windows Mail and the Virginmedia server. My incoming server is IMAP. All the settings are correct as far as I can tell.
What is strange is how emails which were sent yesterday from friends just to see if it was working have not arrived only new mail from this morning has arrived.