Companies embed trackers in images and links within email messages, letting them collect information like when you’ve opened a message, where you were when you opened it, and what device you were using. We’ve found that 85% of emails contain trackers. If that isn’t creepy enough, this email data can be used to profile you, including to target you with ads, and influence the content you see online. Ever open an email and see a related ad about it soon thereafter? Yup, blame email trackers. This data about you is also usually sent directly to third parties, most likely without your consent.
Prior versions on GitHub.