Dude's been emailing non-stop ... might be time for a visit.
Filter them. You're just feeding a troll. He may not be consciously trolling but that's effectively what he is--an accidental troll. Any response at all is going to encourage him. He might run out of steam if his emails are ignored, or he won't and it won't matter because they're going right in the trash. He can amuse himself with sending emails to his heart's content.