(Don't) Return to Sender: How to Protect Yourself From Email Tracking
Unfortunately, that’s often not how it happens. Many senders, including the U.S. government, do email tracking clumsily. Bad email tracking is ubiquitous, secretive, pervasive, and leaky. It can expose sensitive information to third parties and sometimes even others on your network. According to a comprehensive study from 2017, 70% of mailing list emails contain tracking resources. To make matters worse, around 30% of mailing list emails also leak your email address to third party trackers when you open them. And although it wasn’t mentioned in the paper, a quick survey we did of the same email dataset they used reveals that around 80% of these links were over insecure, unencrypted HTTP.
Here are some friendly suggestions to help make tracking less pervasive, less creepy, and less leaky.
Read more at EFF