“Start by targeting the email messages businesses first give you when you register, ” claims Bobby Richter, whom heads privacy and safety testing for Consumer Reports. “Search your inbox for variants on expressions like ‘welcome to, ’ ‘new account, ’ ‘password, ’ or ‘confirm your e-mail. ’”

“Start by targeting the email messages businesses first give you when you register, ” claims Bobby Richter, whom heads privacy and safety testing for Consumer Reports. “Search your inbox for variants on expressions like ‘welcome to, ’ ‘new account, ’ ‘password, ’ or...