When can I postmark it?

The postmark does have legal effect, and it really can't be covered in the blank, otherwise the postal department and the salesperson will be responsible for the problem.

The postmark on the stamp is stamped by the post office staff, and a letter (or postcard or parcel) has two postmarks: one is the postmark on the stamp, stamped by the post office where the letter was sent, and the postmark shows when and by which post office the letter was sent; Another postmark is stamped by the post office that received the letter, showing the time when the letter arrived at its destination. The postmark of the mailroom cover is usually on the back of the envelope. ?

It is precisely because the postmark is the imprint left by the postal department when dealing with a certain business, therefore, for the postal department, its function mainly reflects the standardization, seriousness, reliability and informationization of the postal system. Its existence left a reliable evidence for later checking the trace of a merchant.

Extended data:

Postmark can also truly reflect the category of postal services. In different historical periods, the postal business scope is different, and the postal operation links are also different. The functional stamps or business stamps of postal service are important contents of stamp collecting in postal history. Such as shipping, trains, cars, mobile, temporary post offices, etc. , showing the seals of cylinder taking, business, surface mail, letter, express delivery, flat brush, quality inspection, confidentiality and delivery in different links of postal operation.

Postmark also has commemorative and publicity functions, mainly through commemorative postmark and landscape postmark. Commemorative postmarks are usually used for new postal issues and major festivals; The postmark of a scenic spot is a postal datestamp engraved with local landscape patterns, which is used by the post office where the scenic spot is located. It not only has the function of common datestamp, but also has the function of publicity.

Baidu Encyclopedia _ Postmark