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  2. Postal address verification - Wikipedia

    en.wikipedia.org/wiki/Postal_address_verification

    If the address is valid, it is assigned a ZIP+4 code something like this: 12344-5678, where the first five digits are the ZIP code and the trailing four digits are the delivery range. An address with a ZIP+4 code (or nine-digit ZIP code) is considered to be valid. In most cases, this means that the address is deliverable.

  3. Delivery point - Wikipedia

    en.wikipedia.org/wiki/Delivery_point

    When combined with the ZIP + 4 code, the delivery point provides a unique identifier for every deliverable address served by the USPS. [1] The delivery point digits are almost never printed on mail in human-readable form; instead they are encoded in the POSTNET delivery point barcode (DPBC) or as part of the newer Intelligent Mail Barcode (IMb ...

  4. Intelligent Mail barcode - Wikipedia

    en.wikipedia.org/wiki/Intelligent_Mail_barcode

    This section of the code may be omitted, but if it is present, the 5-, 9-, or 11-digit forms of the ZIP Code are also encoded in the Intelligent Mail barcode. The full 11-digit form includes the standard 5-digit ZIP code, the ZIP + 4 code, and a 2-digit code indicating the exact delivery point. This is the same information that was encoded in ...

  5. List of U.S. state and territory abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._state_and...

    US military mail code: AA: U.S. Armed Forces – Europe [e] US military mail code: AE: U.S. Armed Forces – Pacific [f] US military mail code: AP: Nebraska: Obsolete postal code [g] NB: Northern Mariana Islands: Obsolete postal code [h] CM: Panama Canal Zone: Obsolete postal code: PZ PCZ 594: CZ: Philippine Islands: Obsolete postal code: PH ...

  6. POSTNET - Wikipedia

    en.wikipedia.org/wiki/POSTNET

    A 9 digit (plus check digit) barcode, containing the ZIP Code and ZIP+4 Code, referred to as the "C" code. 52 bars total. The 9-digit barcode enabled the sorting of mail to the individual delivery carrier, and in some cases into a semblance of delivery sequence. An 11 digit (plus check digit) barcode, containing the ZIP Code, ZIP+4 Code, and ...

  7. Use full headers to find delivery delays or a forged email's ...

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

    An email sender can forge false information to make it look like the email came from a different address than it really did, but you can find the true information in the full header. Find the true address. 1. View the full header as described above 2. Compare the bottom From: address to the address in either the Received or Mailfrom field. 3.

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

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

    This often means your email address has been blocked from sending mail to a specific contact because your address has been blocked by privacy or spam control settings set by the owner of that account. Should this happen, you'll need to check with that contact to make sure you haven't been accidentally added to their blocked or spam list.

  9. AOL Mail

    mail.aol.com/d?reason=invalid_cred

    You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563. Should you need additional assistance we have experts available around the clock at 800-730-2563.