Exchange 2003 with ScanMail SPAM Filter possible relaying

We use Exchange 2003 (SP2) with Trend Micro ScanMail for SPAM/Virus Filtering. We have a real problem with SPAM getting through the filter! I noticed in the real time ScanMail log it show messages found at SMTP.  Does this mean Exchange is accepting email from SMTP? I pasted two examples below..

4/6/2007 12:08:33 PM - Message from "ha-melody.com@vadivorceattorney.com" found at "SMTP" [total 1 recipient(s)]
4/6/2007 12:06:25 PM - Message from "noreply@gearedon.com" found at "SMTP" [total 1 recipient(s)]
pharmon96Asked:
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Joekim24x7Commented:
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