
Originally Posted by
byzantium
This tends to only work with Western style mailing systems, those in Canada, Europe, Australasia, and some parts of Asia. The third world tends to not have the same idea of postal integrity as the West does. Shipping packages to parts of Africa, for example, tends to result in the packages being stolen and you getting a blizzard of Nigerian style scam letters in return. Other countries, especially in Latin America, have postal systems which deliberately "lose" everything mailed from the USA. There was one country, maybe Niger, which in the 90s had postal employees making odd requests, usually to take nude pictures of oneself, of senders of mail from the West.
On the Korean peninsula, where the Cold War never ended, the two sides love to steal each other's mail and send the sender propaganda mailings stating the interceptor's point of view. Americans in Korea usually avoid this by using the military postal system, but the civilian system is plagued with North Korean theft. The South steals the North's mail in return. Other systems open all foreign mail, no exceptions, and go through it. If they don't like it, into the trash it goes. China especially tends to be rather capricious with foreign mail.
This is why I avoid being an "authority" on stuff from foreign countries unless I can get verifiable information. I was in the shortwave radio hobby for 20 years, where lists of mail system oddities were passed around due to the side hobby of getting "QSL" signal verifications from all over the world, something I never cared about personally. It's easy to say "ship all over the world" and then getting fake credit cards from Ghana and Communist literature from North Korea in the mail instead of happy customers.