I've always had an email address for him. He just NEVER responds. That's how he maintains complete control over the communication between us. He popped up after a year to tell me the dog was sick. Then he replied the day after the dog died, I presume because he got something out of it (talking to someone - me - who felt the same way about the dog as he did). Now he's vanished again.
He claimed he has to go to the library to email me, which is why he never reads or responds. I call b.s. He's not in prison. He could check email on his phone or at work if he wanted to. He just can't be bothered.