Last week we had 4,400+ e-mails in out output quue in our Exchange 2003 server. We changed all of the administrator's passwords and the problem appeared to have stopped. This morning I notice the same number of e-mails int the output queue. The mail's subject is "Hello dear nenber" and the sender is "Satander - Online Banking".. I checked to see if the mail server was not an Open Relay and it does not seem to be. I've cheked the and have a number of Event id 7000 "Tis is an SMTP protocol log for virtual ID 1, connectino $70803. .....The full command was sent from mail from <email@example.com".
I am not even sure where to start looking for the cause of this problem. Any help would really be appreciated.