What can I do to get back at someone (some sort of?

revenge - I know its not right)? I know it sounds childish but he tried to ruin by marriage so I want to get him back. I thought of subscribing to a site and putting his e-mail address in or something so that his wife can get some mails. Problem is, when I register him he will get an e-mail telling him he is registered and I am sure he will then know it is me. I just want like the monthly newsletter to get mailed to their e-mail. What else could I do?