How many times a day do you check email? We know that web trackers snoop and stalk us when we surf, but the same could be said of email tracking. In fact, it’s much more intense than you likely realized according to “I never signed up for this! Privacy implications of email tracking” (pdf); the paper was written by Princeton University researchers Steven Englehardt, Jeffrey Han and Arvind Narayanan for the PETS 2018 (Proceedings on Privacy Enhancing Technologies).
The researchers called email tracking “pervasive” as 85% contained embedded third-party content; of those, 70% are the same ones that are involved in web tracking.