Right. I'm just also trying to make the point that without direct access to the account or server, there's always going to be the possibility that digital evidence has been tampered with. It's kind of an inherently difficult thing to prove if you don't simply trust that the person is operating in good faith.
This would be a very strong case of libel if he fabricated emails and would effectively be a career ender for him. I doubt he would go that far.