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  2. Return address - Wikipedia

    en.wikipedia.org/wiki/Return_address

    The return address should include an address or P.O. box details in the same way as the delivery address should. In most countries such as United States, Canada, Australia, France, the return address is located in the upper left-hand corner of the envelope, card, or label, which is also recommended by the Universal Postal Union.

  3. Postal address verification - Wikipedia

    en.wikipedia.org/wiki/Postal_address_verification

    Postal address verification (also known as address , address validation, address verification and CASS certification) is the process used to check the validity and deliverability of a physical mailing address. According to the United States Postal Service, an address is valid (or mailable) if it is CASS-certified, meaning that it exists within ...

  4. United States Postal Service - Wikipedia

    en.wikipedia.org/wiki/United_States_Postal_Service

    The full eagle logo, used in various versions from 1970 to 1993. The United States Postal Service (USPS), also known as the Post Office, U.S. Mail, or Postal Service, is an independent agency of the executive branch of the United States federal government responsible for providing postal service in the United States, its insular areas, and its associated states.

  5. Dead letter mail - Wikipedia

    en.wikipedia.org/wiki/Dead_letter_mail

    Dead letter office. A dead letter office ( DLO) is a facility within a postal system where undeliverable mail is processed. [4] Mail is considered to be undeliverable when the address is invalid so it cannot be delivered to the addressee, and there is no return address so it cannot be returned to the sender.

  6. Express mail in the United States - Wikipedia

    en.wikipedia.org/wiki/Express_mail_in_the_United...

    Priority Mail Express is an accelerated domestic mail delivery service operated by the United States Postal Service. It provides overnight delivery to most locations within the continental United States and guaranteed delivery within 2 days. Unlike most other USPS delivery options which provide only delivery confirmation, Priority Mail Express ...

  7. Registered mail - Wikipedia

    en.wikipedia.org/wiki/Registered_mail

    Standard return receipt requires use of PS Form 3811, which is a green postcard-sized paper: upon delivery, this paper is mailed back to the sender and serves as legal proof of delivery. USPS now offers Return Receipt Electronic (RRE) as an alternative to the traditional mailing back of the PS Form 3811 card.