I used to make a completely pointless walk to the mailbox every afternoon. Down the driveway, flip it open, nothing there. Some days I did it twice. The mail carrier has no fixed schedule here, so I ...
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Ring Mailbox Sensor

The latest member of the Ring family of smart home devices, the Ring Mailbox Sensor ($49.99 with the required bridge) is a wireless motion sensor that lets you know when your mailbox has been opened.