Ancillary Service Endorsement

Ancillary Service Endorsement

A service offered by the U.S. Postal Service in which it sends information to a mailer on the new address of a recipient if that address has changed. The Postal Service charges a fee for this service. See also: ACS.
References in periodicals archive ?
Other USPS-approved methods that meet the Move Update requirements include using FASTforward MLOCR processing (letter mail only), ACS (Address Change Service) and Ancillary Service Endorsement.