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  2. POSTNET - Wikipedia

    en.wikipedia.org/wiki/POSTNET

    Subtract the sum modulo 10 from 10. Continuing with the example, 10 − 8 = 2. The check digit is therefore 2. If calculated correctly, the sum of the ZIP, ZIP+4, or ZIP+4+delivery point digits and the check digit will always be a multiple of 10. Continuing with the example above, (5+5+5+5+5+1+2+3+7+2) = 40, and 40 mod 10 = 0.

  3. History of United States postage rates - Wikipedia

    en.wikipedia.org/wiki/History_of_United_States...

    The ship fee, including the ship rate on letters for delivery at the port of entry, were on a per letter basis, rather than weight. The United States issued its first postage stamps in 1847. Before that time, the letters' rates, dates, and origins were written by hand or sometimes in combination with a handstamp device. [1]

  4. U.S. Special Delivery (postal service) - Wikipedia

    en.wikipedia.org/wiki/U.S._Special_Delivery...

    The stamp bears the words "Secures immediate delivery at a special delivery office,". In 1886 the Special Delivery service was expanded to all post offices and a new stamp was designed. The revised stamp was identical to the first issue of 1885 but instead bore the statement "Secures immediate delivery at any post office."

  5. Back-of-the-envelope calculation - Wikipedia

    en.wikipedia.org/wiki/Back-of-the-envelope...

    The defining characteristic of back-of-the-envelope calculations is the use of simplified assumptions. A similar phrase in the U.S. is "back of a napkin", also used in the business world to describe sketching out a quick, rough idea of a business or product. [1] In British English, a similar idiom is "back of a fag packet".

  6. Postage stamps and postal history of the United States

    en.wikipedia.org/wiki/Postage_stamps_and_postal...

    The 5-cent stamp paid for a letter weighing less than 1/2 ounce and traveling up to 300 miles, the 10-cent stamp for deliveries to locations greater than 300 miles, or, twice the weight deliverable for the 5-cent stamp. Each stamp was hand engraved in what is believed to be steel, and laid out in sheets of 200 stamps.

  7. Mail - Wikipedia

    en.wikipedia.org/wiki/Mail

    Mail envelope (back to back) The word mail comes from the Middle English word male, referring to a travelling bag or pack. [2] It was spelled in that manner until the 17th century and is distinct from the word male. The French have a similar word, malle, for a trunk or large box, and mála is the Irish term for a bag.

  8. Postmark - Wikipedia

    en.wikipedia.org/wiki/Postmark

    Hawai'i Post, a discontinued personal delivery service, once had a surfboard mail postmark, for covers that traveled by surfboard. [8] A colour postmark is on the United States Postal Service-issued collectible envelope commemorating the 2004 inauguration of George W. Bush. [citation needed] London Penny Post postmark and heart-shaped timestamps

  9. Registered mail - Wikipedia

    en.wikipedia.org/wiki/Registered_mail

    Registered mail is a postal service in many countries which allows the sender proof of mailing via a receipt and, upon request, electronic verification that an article was delivered or that a delivery attempt was made. Depending on the country, additional services may also be available, such as: