How can you find out which machine on your network is submitting a message to Microsoft Exchange for delivery outside your network?
We have experienced the outbound Exchange queue being flooded with spam even though we have outbound relay disabled from any machine except the server itself. We are trying to determine whether a machine on the network is using Outlook to send spam, but have been unable to identify the culprit. Extensive searches of the Internet have failed to turn up any tools to track down the source.
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