Analysis of information sources in references of the Wikipedia article "United States Postal Service" in English language version.
Internal newsletters detailed a huge loss for the USPS in the failed delivery of packages sent from the USA via surface. Since the USPS cannot dictate how scores of different countries handle surface mail, and since its agreements required the USPS to take back undeliverable parcels, the losses were mounting.
The reason, probably, why no other dealers offer it: ... it is very difficult and time-consuming to do. Plus, there is no tracking, no insurance, and lots of complaints — as those packages can easily take 60 days to arrive.
{{cite web}}: CS1 maint: archived copy as title (link)The U.S. Postal Service establishes ZIP codes and mailing addresses[...]
{{cite web}}: CS1 maint: bot: original URL status unknown (link){{cite web}}: CS1 maint: archived copy as title (link)Internal newsletters detailed a huge loss for the USPS in the failed delivery of packages sent from the USA via surface. Since the USPS cannot dictate how scores of different countries handle surface mail, and since its agreements required the USPS to take back undeliverable parcels, the losses were mounting.
The reason, probably, why no other dealers offer it: ... it is very difficult and time-consuming to do. Plus, there is no tracking, no insurance, and lots of complaints — as those packages can easily take 60 days to arrive.