And with cryptocurrency, payment to the individual people worldwide serving as drop-couriers in an end-to-end dropgang network become perfectly possible. Whether unrapping layers of scannable qr-code hop-by-hop, distributed blockchain based hop-tracking and payment services, smart contracts, etc. Infinite options arise. There is no "law" that can ever be against the harmless human right to transfer a letter / parcel / datapack / physible / knowledge from person to person, peer to peer, location to location. Same goes for ridesharing, abodesharing, etc. Anyone can startup such alternative delivery networks today. Tap that app!
Interesting idea about drone-driven mailbox-loader!
A single drone might be able to do it with some sort of handle grappling, electromagnet, slide ramp, slot shooting.
the mail will go through the USPS, and they have the opportunity to photograph (and weigh?? and X-ray???) it.
Photo is not an "oppurtunity", it is an "is already done" spying surveillance by USPS. https://www.nytimes.com/2013/08/03/us/postal-service-confirms-photographing-... https://techcrunch.com/2017/03/31/the-post-office-will-now-email-you-photos-...
Even if it doesn't involve advanced concepts like drones, it is an extraordinary advance, mostly made possible by the ubiquitous availability of GPS and other GNSS signals. I would guesstimate that at least 1% of a city or town's surface area would be suitable for placing a drop.
With hops for more valuable contents being placed outside the human footfall traffic of the cities... in woods, parks, mountains, water, sky balloons.