Even if Wikileaks did produce such an email I don’t believe that it could be used in a court of law because there would be no chain of custody.
How could it be proven that the email was actually from or to Hillary Clinton?
At best such an explosive email would embarrass Hillary and plant doubt in the minds of undecided voters that would cost her the election.
“How could it be proven that the email was sent through Clinton?”
Maybe Putin or Xi could help us out there!