As I mentioned earlier, our server was down for about a day and a half, from just after midnight Wednesday night, until just after noon today.
There were actually 2 problems - First the server needed to be restarted, and then the Domain Name Server had to be reset to point to the correct IP Address.
That was the cause of the CONFIRM messages a number of you got when you tried to send messages to the list.
Everything should be back to normal now. Thanks for your patience.
Paul