I have a brand new server running Microsoft Small Business Server 2003. I have recently noticed that a large volume of spam e-mail is going out of our server. The problem seems to be an open relay problem because I shut down all workstations last night and there were about 50 emails sent from the server. The SMPT log shows the e-mails going to random addresses and the From field is blank. I have scanned the computer for viruses and nothing was found. My Exchange Server settings prohibit relaying and my server seemed to pass an open relay test. However, there is no question that a large volume of spam e-mail is leaving the server. Any help is appreciated.
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Open Relay problem