Joke Collection Website - Mood Talk - What is the moth express of world culture?

What is the moth express of world culture?

It seems that the format is similar to that of a card. There are postcards with the recipient's address and so on. The format of writing letters seems to be a way to express feelings by sending letters to distant relatives (there should be similar articles in related fields, [original by the author]). Moth Express was only listed at the beginning of this year, but it seems that there is little relevant information.