Exchange 2003 SP2 running on SBS queues flooded with spam
Posted on 2011-02-28
One of my clients is running SBS 2003 with Exchange 2003 SP2. We've been having a problem for days with the queues flooded with thousands of SPAM messages. First thing we checked was for an open relay, which the server is not. I followed some of the tips mentioned in other EE posts, but so far I haven't been able to get to the bottom of this. The server has been cleaned of any virus infections, we unplugged all of the workstations and left only the server on over the weekend, and Saturday morning there were thousands of messages queued. I disabled all of the user accounts in case one of them was hacked, changed the administrator password, etc... but the queues qould still build up. In the SMTP virtual server properties I disabled anonymous authentication, which did stop the spam, but users were unable to receive email. We tested from our Exchange server and the messages would sit in our queue. I enabled logging on the SMTP virtual server, but that didn't give us any information. We have spent hours and hours trying to figure this out with no promising results. I am at my wits end here, and I would appreciate any help I could get. Any ideas? I keep disabling SMTP and purging the queue folder, force closing connections, etc...