Shien mail

I think you meant "Shin Mail"!

Shin Mail is a Japanese postal service that was established in 1871, shortly after the Meiji Restoration. It was the first modern postal service in Japan and was responsible for delivering mail and packages throughout the country.

The name "Shin Mail" is a combination of the Japanese words "shin" (), meaning "new" or "modern", and "mail" (), which is a loanword from English. The service was initially known as the "Shin Mail" because it was a modern and innovative way of delivering mail, using steamships and railways to transport mail across the country.

Today, Shin Mail is still an important part of Japan's postal system, and it is operated by Japan Post, a government-owned corporation.