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Ring Mailbox Sensor review: know when the mail has arrived - The Verge
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DIY WiFi mailbox sensor with ~12 years of battery, featuring ESP-NOW for subsecond transmission rates and MQTT. More info in comments : r/homeassistant
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Ring Wi-Fi Smart Mailbox Sensor White B08FBLXDND - Best Buy
Gate smart mailbox combines snail mail and the Internet of Things
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Triple-Sensor Mailbox Alert – Galactic Studios
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Postybell - The first post box sensor that works from any distance | Indiegogo
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The laser USB mail box
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