I notice you didn't post the whole email text, did the sender named you like mentioned your name in the email?
If not then they're just sending random emails. if they did named you, you might have to think who knows you're into bitcoin, be warned.
in anycase, don't respond to them and put them to spam list.
The sender did not mention any identifying details, and in fact, there were a lot of random emails in the To: header (which is actually consistent with the premise). I included the entire body of the email, less html formatting and a non-aol email address at the bottom, which was not authenticated in any way - and I didn't want to taint the reputation of the innocent. (Surely the scammer wouldn't use his *own* real email?)
It just occured to me - maybe he generated a new bitcoin address for each recipient? Would that be feasible? It probably would be if he had an actual list - and would allow him to know who paid him off.