Non-standard AS2 MDN response being sent to partner

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A partner is sending an AS2 message and the webMethods response is a text/html “report” that includes in a TD cell way down in the HTML the ACTUAL MDN response that should be sent back to the partner. How is this being configured? See attached file - search for "Content-Type: multipart/signed; " and you will find the “embedded” response that is being expected but is instead wrapped up in what appears to be a webMethods report for internal logging