The discussion clarifies that the message icon in "My Posts" does not indicate replies but rather signifies new messages, with an open envelope representing new messages and a closed envelope for old ones. Participants agree that this is not a bug and that the icons function as intended. It is noted that messages remain marked as new until the user logs out or is logged out due to inactivity. For tracking replies to threads, a specific user control panel link is recommended for easier access. Overall, the confusion about the icon's meaning is resolved.