Generally the best way to do this is to post an email regarding NDA, payments, whatever sent to a large group and block out the "To" but keep the sender and as much of the content as possible.

Up to you if you post it publicly, I couldnt see the harm there but alternatively you could email it from a disposable email to a gaming news site. They are very careful with their sources and can help. They have experience breaking stories like this. You should get a reply in less than 2h from most press sites for a story like this.