Keep out of it
Flash it not the moral police so just keep his beak out. Consider this outcome:
Flash forwards the email to recipient, recipient is not happy with email and reports it , sender quite rightly says that he did not send it to them, Flash in the poo right up to his neck.
What a decent person would not have done is to mention the details to anyone so much better to bounce and not be such a nosey bugger.
Biting the hand that feeds IT
