This is a common roadside mailbox, most platforms show blue or gray mailbox, the red flag is lowered and the mailbox is closed, it can indicate the meaning of e-mail, postal delivery. It generally indicates that there are no letters waiting to be received, and it can also indicate that the outgoing mail has been picked up. It is recommended to use it with the text.
😊 Note the difference between it and
📭 (open mailbox with lowered flag),
📫 (closed mailbox with raised flag),
📬 (open mailbox with raised flag).