Buyers are notified by email each time you send a message. If a buyer doesn't view your message on MrPlates, your message will remain 'Unread'.
It is not uncommon to receive an initial inquiry from a buyer, who then doesn't respond to your follow up message. Although we encourage MrPlates users to respond to every message they receive, some buyers will simply stop communicating if they are not interested any longer.
If you don't hear back after 3 days (and the message is still Unread), feel free to send a polite follow up message asking for a reply.