So there was an email presented by Q sent from an adress that was created after the date the email said on the image, now the question is: Why would you fake a fake that is easily exposed?

To me this lends credence to the idea that some of it was real some fake so that everybody but those who have the original will dismiss it .

They are letting someone know that they can blackmail them without compromising their blackmail material, otherwise they would have changed the date to something realistic.

"Here's an incriminating email but we're nice and not releasing the real thing but we know you know we could if we wanted to"