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  2. 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:

  3. Postal address verification - Wikipedia

    en.wikipedia.org/wiki/Postal_address_verification

    According to the United States Postal Service, an address is valid (or mailable) if it is CASS-certified, meaning that it exists within the comprehensive list of mailable addresses in their Address Management System. This is different from the credit card Address Verification System (AVS), which is the method used by credit card processors to ...

  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 simply the 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 associated states.

  5. Use AOL Certified Mail to confirm legitimate AOL emails

    help.aol.com/articles/what-is-aol-certified-mail

    When you open the email, you'll also see the Certified Mail banner above the message details. When you get a message that seems to be from AOL, but it doesn't have those 2 indicators, and it isn't alternatively marked as AOL Official Mail, it might be a fake email. Make sure you mark it as spam and don't click on any links in the email.

  6. Find delivery delays or identify the sender in AOL Mail

    help.aol.com/articles/use-full-headers-to-find...

    An email sender can make it look like the email came from a different address, but you can find the true information in the full header. 1. View the full header following the steps above.

  7. Informed Delivery - Wikipedia

    en.wikipedia.org/wiki/Informed_Delivery

    The Postal Service takes measures to ensure the security and privacy of consumers’ mail. Because Informed Delivery offers increased visibility into both mail and packages being delivered to an individual’s address, USPS verifies identities of individuals, including the use of a mail-based verification letter.

  8. Proof of delivery - Wikipedia

    en.wikipedia.org/wiki/Proof_of_delivery

    When the sender sends multiple documents through the mail, there is a possibility of some not reaching the intended recipient. A post office may provide an additional service of guaranteed delivery, known as an avis de réception (advice or acknowledgment of receipt), wherein they require the recipient to sign a paper, and that paper is filed ...

  9. Why did I receive an email from MAILER-DAEMON? - AOL Help

    help.aol.com/articles/what-is-a-mailer-daemon...

    When you get a message from a "MAILER-DAEMON" or a "Mail Delivery Subsystem" with a subject similar to "Failed Delivery," this means that an email you sent was undeliverable and has been bounced back to you. These messages are sent automatically and often include the reason for the delivery failure.