A post office is a customer service facility forming part of a national postal system. Post offices offer mail-related services such as acceptance of letters and parcels; provision of post office boxes; and sale of postage stamps, packaging, and stationery. In addition, many post offices offer additional services: providing and accepting government forms (such as passport applications), processing government services and fees (such as road tax), and banking services (such as savings accounts and money orders).The chief administrator of a post office is a postmaster.

A post box (British English and others, also written postbox, known in the United States and Canada as collection boxmailboxpost box, or drop box) is a physical box into which members of the public can deposit outgoing mail intended for collection by the agents of a country's postal service. The term post box can also refer to a private letter box for incoming mail.

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now i cant if some one also answer my qustion only i can
ya ovyo!
u can reffer to others' answer then u can decide!