Address Correction Requested (ACR)

Address Correction Requested (ACR) - A service of the USPS that can be requested by printing the words "Address Correction Requested" in the upper left corner of the mailpiece. If the address is undeliverable, the Postal Service will provide the mailer with the forwarding address of people who have moved, or will indicate a reason for non-delivery(such as "no such address," "unknown at this address," "forwarding time expired," etc.). The charge for this service varies depending upon the class of mail and the weight of the mailpiece.

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Source: Postcom, 04 February 2010 10:46:47, http://postcom.org/public/admail_image/glossary.htm