If you have been emailing the chief of homeland security trying to get her attention, try the telephone instead. “No such user exists” is what you’d probably get if you tried emailing. Homeland Security Secretary Janet Napolitano has admitted at a cyber security summit that she doesn’t even have an email account. She is thinking it is one way to keep the hackers at bay. “Some would call me a Luddite,” Napolitano is quoted as saying, “but that’s my own personal choice.”