How can the letters of China Post be categorized? I'm not sure how to do that, but I'd like to be a little more specific.

1. According to the processing time limit is divided into ordinary mail, postal express and express mail. Ordinary mail is the mail which is delivered and processed according to the general time limit; postal express is a kind of priority processing, with clear time limit requirements, and the mail arrives in a limited period of time; express mail is the mail which is delivered at the fastest speed and through the collection, processing, transportation and delivery by special organization, and it implements the door-to-door and desk-to-desk services. The general mail with little time limit can be delivered by ordinary mail; the mail with certain time limit can be delivered by postal express; the mail with strong time limit can be delivered by express mail.

2. According to the nature of the contents are divided into two categories of letters and parcels. Correspondence is divided into letters, postcards, printed matter and blind characters.

3. According to the processing procedures are divided into ordinary mail and to the mail. Ordinary mail does not give a receipt when the post office receives and sends it, does not register when processing, and does not require the recipient to sign for it when delivering, and does not deal with inquiries; the mail to be given a receipt when the post office receives and sends it, registers when processing internally, and requires the recipient to sign for it when delivering, and can deal with inquiries, so the more important mails are to be sent according to the mail to be given; the mail to be given includes registered letters, insured letters, parcels, postal expresses, and special express mails.

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4. According to the liability of the post office is divided into insured mail and non-insured mail. Insured mail is the user in accordance with the provisions of the insured price procedures and pay the price of the mail to the evidence. The highest insured limit for each piece of insured mail is 50,000 yuan, and the premium is charged at 1% of the insured amount, with a minimum premium of 1.00 yuan per piece. When the mail is lost or damaged, the post office will bear the responsibility of compensating according to the insured amount for the insured mail; the non-insured mail will be compensated in accordance with the limits stipulated by the Ministry of Post and Telecommunication; and the ordinary mail will not bear the responsibility of compensation.