I am the kind of person who organizes the emails they want to keep into folders and saves them indefinitely. It’s nice to be able to search back through them when I’ve forgotten something. Are you that kind of person too?
If you are, I bet you’ve been functioning, as I have, with the delusion that this was a safe place to put your emails. That emails, like the post, are protected from data harvesting and warrantless snooping. The reality is that there are a lot of holes to email privacy. EFF explains: Deep Dive: Updating the Electronic Communications Privacy Act | Electronic Frontier Foundation.