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Viewing E-mail message content whil in transit

Running Exchange 2010. I have a mainframe system that relays emails through my Exchange 2010 server to outside recipients. It is being reported that content of the email received is not the same as the content of the e-mail that was sent. Is it possible to view the content as it entered/passthrough my exchange server to try and see if/when the message content was changed (if at all).

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Software and Hardware Engineer
not directly. However, you can (for example) use packet captures on the server with the smtp bridgehead on it, and extract the mail entering and leaving from the capture.

And yes, exchange *is* known for rewriting and otherwise mangling though traffic :(