我国《邮政法》规定：“信件和其他具有信件性质物品的寄递业务由邮政企业专营”；《邮政法实施细则》则对信件的定义作了具体的解释：“信件是指以套封形式传递的缄封的信息载体。其他具有信件性质的物品是指以符号、图像、音响等方式传递的载体”，并授权邮政部规定信件的内 China’s “Postal Law” stipulates: “letters and other mail items with the nature of the postal service by the postal business franchise”; “Postal Law” is the implementation of the letter on the definition of a specific explanation: “Letters are in the form of sets of envelopes Of the sealed carrier of information other items of the nature of the letter refers to the symbol, images, audio, etc. carrier ”and authorizes the Ministry of Posts within the provisions of the letter