Failed/Bounced Message Export

Hi,

We have a Network Printer using our Exchange 2013 as a relay, using a virtual mailbox as Sender (non-existent mailbox).

One of the scan-to-mail jobs was around 55 mb and sent to a Gsuite User, where their limit as per Google is 50 mb, so the message bounced back. The problem is we don't have the physical document no more and we need to retrieve the failed email to extract the attached scanned file. Any help on that?

Thank you.

Regards;

Khalil S.