1pt mail

You're referring to the 1pt mail service!

1pt mail, also known as 1-point mail or 1-point postal service, is a type of postal service that is commonly used in Japan. The name "1pt" comes from the Japanese word "ippin," which means "one point" or "one point of delivery."

Here's how it works:

Overall, 1pt mail is a convenient and reliable way to send packages and letters in Japan, and it's widely used by individuals and businesses alike.