The difference between the formats of ancient poetry and letters

The format of letters in ancient my country includes these parts: introduction, body, conclusion, signature, introduction, date and atmosphere, greetings or greetings. The most important part is the text, which is the main content of the letter. The content of the letter varies, and there is no fixed way of writing. Just express the accurate meaning. The format of ancient letters is basically the same as that of modern letters. The biggest difference is that ancient people wrote letters vertically, starting from the right side, while modern letters are written horizontally, starting from the left side.