Mark,
I've discovered that the events leading up to the problem are somewhat confused and may not be exactly as reported. We've managed to side-step the problem and continue the game by temporarily running the game on the old machine and using a different machine's email.
I'm going to try and duplicate the events that led up to our problem (so far it seems to have been an email problem and does not appear to be a hardware problem as it seemed at first) and will re-email you games if we manage to duplicate the problem.
Gary