My (now-ex) bf is blocked on all media except email as we needed to liaise about closing a joint bank account.
He's just sent me an email and in the inbox where you can preview the subject and first line or so of the body of the email is something along the lines of app.mailtracker.com etc. This doesn't appear in the email itself.
Google says it's an app to see whether someone has read your emails. I've left him because he's controlling and has basically been emotionally abusive. Has anyone come across this or maybe know how to disable it?