The Emails that you are seeing in the Systems root
inbox are not the Original Emails. They are Postmaster Notifications.
You receive a Copy of the Original Email as Attachment with this Notification. But this Notification isn't an Email anymore. It is rather a Text File of what the Original Email was.
If you recent this Attachment it would get to the Destination as another Email coming from another Sender.
Actually a Script could process this Text File and build from there a new Email but it would always reach the Receiver as coming from a new Sender.
Nowadays most Email Provider do a very strictly check that would reject this rebuilt Email as Fake Email.
If your really want to extract and process the attached Email the Email Boundary might help you.
Content-Type: multipart/report; report-type=delivery-status;
boundary="w5S0flL1016282.1530146508/mail01.server.com"
Subject: Postmaster notify: see transcript for details
Auto-Submitted: auto-generated (postmaster-notification)
This is a MIME-encapsulated message
--w5S0flL1016282.1530146508/mail01.server.com