I already deleted the account since I thought maybe email was being mis-routed and maybe the client would not be getting thier email when checking with outlook?
But they get a lot of spam so I could turn it back on until a message comes through and then turn it off again.
It only seems to be happening to one email address on that account.
Now I think I know.
Its not mail from me but there is a forward setup on another site that is hosted here also. So all of the forwards are going to newly created account.
I guess you would be able to see that in the header if I would have saved the messages.