Sadly my hopes of getting a mailbox opened notification seem to be a lost cause. The 433mhz sensor doesn't have enough power to reach the 80 feet to the street. The Zigbee one does reach that distance, but not once it's inside the mailbox.
I just found a LoRa line of home automation products, and while I'm not a fan that their Home Assistant integration is all through the cloud API, I might have to give it a shot for this anyway.
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