You may not know it, but many people who send you email know the exact moment you open it and even where you happen to be when you open it. As The New York Times explains, many people and companies have been using small pieces of code that can track both the location and the time when someone opens up the emails they send. In the piece’s example, an investor immediately received a phone call from a startup company shortly after he opened an email that he received from it earlier in the day. Essentially, they knew the exact moment he opened up the message and pounced to see if they could spark his interest in making an investment.
This is, to put it simply, a little weird. Thankfully, there are ways to stop some of these trackers from keeping tabs on you by disabling the feature in email that automatically loads images within a message.