I was really hoping someone with more expertise with ST electronics could help with this project. I have an issue where I believe a neighbor has been in my mailbox, not only that, but I would also like to know when the mail has been delivered. So to solve both issues, I was thinking of installing a photo-eye reflective sensor in my mailbox and attaching it to one of the ST universal sensor. Does anyone know if such sensors can handle a photo-eye sensor? Or can you recommend another technique to resolve my problems?
a regular wireless door contact will probably work.
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That does work, am doing it like that, just have a smartthings SmartSense Multi that supports acceleration in your mailboxfloor, when acceleration is active someone is in your mailbox or mail has been thrown onto the device 
the new ST multisensor (coin cell battery), for 2 out of 2 devices I tested, acceleration capability has been far too sensitive to use for any purpose except as a cautionary tale.
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I had an old one lying around, no experience with the new one …
I use this one as a driveway Sensor paired with an ecolink contact Sensor.
Seco-Larm E-931-S35RRQ Enforcer Indoor/Outdoor Wall Mounted Photoelectric Beam Sensor with 35 Foot Range https://www.amazon.com/dp/B001LFPB0M/ref=cm_sw_r_cp_api_XOM0zbR8WXVBE
Distance from house to mailbox?
I say Blink so you know who…
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