E-mail Open Tracking Has Quietly Taken Over the Web
As recently reported in Wired , over 40 percent of e-mails are tracked, according to a study published last June by OMC, an “email intelligence” company that also builds anti-tracking tools. Tracking clients embed a line of code in the body of an email—usually in a 1×1 pixel image, so tiny it’s invisible, but also in elements like hyperlinks and custom fonts.
