With the advent of email, the retronym " snail mail" was coined. Proof of payment is usually in the form of an adhesive postage stamp, but a postage meter is also used for bulk mailing. Since the mid-19th century, national postal systems have generally been established as a government monopoly, with a fee on the article prepaid. A postal service can be private or public, though many governments place restrictions on private systems. The mail or post is a system for physically transporting postcards, letters, and parcels. A United States Postal Service mail truck (a Grumman LLV)
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