> There's an interesting tradeoff -- marketers no longer know your location, browser, or how many times you've opened the email. However, any spammer instantly

> There's an interesting tradeoff -- marketers no longer know your location, browser, or how many times you've opened the email. However, any spammer instantly knows that the email address is valid. Before, however, if you never clicked on "show images" then spammers knew nothing at all.