It's on him to do something about this. Were it me, I'd tell him that and stop responding to his emails. The more you respond, the more he's going to think he'll get "something" out of you sooner or later. All he had to do was to give you his correct address in the first place.
"Once the writer in every individual comes to life (and that time is not far off), we are in for an age of universal deafness and lack of understanding."
(Milan Kundera, Book of Laughter and Forgetting, 1980)