Ok, try this:
In your MailWatch interface, there should be a [ ] next to each mail. If you click on that it should take you into the actual message, where you can view the header and what mailscanner has revealed about the message. At the very bottom of that message box, you'll see a check box for release. If you check the box and hit submit, it should release the message.
Try that and let me know what happens.
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