Does a person know if I mark them as Spam? Updated March 14, 2019 10:20 Follow No, the other party won't have a clue. You can later find the spam messages in the message tab -> spam. Related articles A contact was marked as Spam by mistake Can I send messages for free with your message app? Can Truecaller read my messages? How do I copy a number in a message? Who viewed my profile? Comments 0 comments Article is closed for comments.