Mail carrier in the context of "Royal Mail"

The mail or post is a system for physically transporting postcards, letters, and parcels. 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 postage stamps and postal history of Azerbaijan describes the history of postage stamps and postal systems in Azerbaijan, which closely follows the political history of Azerbaijan, from its incorporation to the Russian Empire in 1806, to its briefly obtained independence in 1918, which it lost to the Soviet Union in 1920 and re-acquired in 1991 after the dissolution of the Soviet Union.