The best one to send I would think would be one that links to a phishing site. Or if you really wanted you could try to set up a fake email that looks similar to blizzards, but I doubt many people would fall for those. I think most people use phishing sites now and your best option would be to set one up/ use one if you already did. Regarding recalls if you want their account I saw a guide which suggested creating a new account under the same name and banning the old one that would probably be the best way to keep the account, but you gotta spend money.