My SBS 2003 using exchange is generating spam mail and sending it out. This is a small home office and I have no other machine connected. I watch the mail que and it keeps adding messages generated by "postmaster.mydomain.com.
I look at the messages and they are all destined for strange domains. obviously spam stuff.
How do I either find out where this is being generated from and get rid of it, or stop it from happening. My problem is that my isp has shut me off till I fix. I have run all kinds of test, Grisoft, Panda, Trend micro, nothing has picked it up.