A possible solution to avoid people finding out the email you're using for a given service is to dump random word/phrase in your email address. e.g. email+ifid

A possible solution to avoid people finding out the email you're using for a given service is to dump random word/phrase in your email address. e.g. email+ifidontknowthisthisisnotme@youremail.com Not sure how an agent would react to someone having part of the correct email though.