Dial-A-ZIP offers US address validation to Endicia Internet Postage, Envelope Manager
Software and a number of OEM software manufacturers. Dial-A-ZIP verifies US mailing
addresses, providing address standardization, ZIP+4 and carrier route information,
Enhanced Line of Travel data, a residential /business delivery flag, a UPS rural-delivery flag,
and the latest USPS Delivery Point Validation service which indicates if a given address is indeed
"deliverable" as determined by the USPS.
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