Mail

The mail or post is a system for physically transporting postcards, letters, and parcels.^[1] A postal service can be private or public, though many governments place restrictions on private systems. Since the mid-19th century, national postal systems have generally been established as a government monopoly, with a fee on the article prepaid. Proof of payment is usually in the form of an adhesive postage stamp, but a postage meter is also used for bulk mailing.

Postal authorities often have functions aside from transporting letters. In some countries, a postal, telegraph and telephone (PTT) service oversees the postal system, in addition to telephone and telegraph systems. Some countries' postal systems allow for savings accounts and handle applications for passports.

The Universal Postal Union (UPU), established in 1874, includes 192 member countries and sets the rules for international mail exchanges as a Specialized Agency of the United Nations.

^ In Australia, Canada, and the U.S., the term "mail" is commonly used for the postal system and for the letters, postcards, and parcels it carries; in New Zealand, "post" is more common for the postal system and "mail" for the material delivered; in the UK, "post" prevails in both senses. However, the British, American, Australian, and Canadian national postal services are called, respectively, the "Royal Mail", the "United States Postal Service", "Australia Post", and "Canada Post"; in addition, such fixed phrases as "post office" or "junk mail" are found throughout the English-speaking world.

[1] In Australia, Canada, and the U.S., the term "mail" is commonly used for the postal system and for the letters, postcards, and parcels it carries; in New Zealand, "post" is more common for the postal system and "mail" for the material delivered; in the UK, "post" prevails in both senses. However, the British, American, Australian, and Canadian national postal services are called, respectively, the "Royal Mail", the "United States Postal Service", "Australia Post", and "Canada Post"; in addition, such fixed phrases as "post office" or "junk mail" are found throughout the English-speaking world.

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