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.
For this reason, many Standard(a) mailers use both NCOA and ACS or ancillary service endorsements to capture as many moves as possible.
By coincidence, July 1 was the start date not only for the Move Update requirement but also the first date on which a new set of ancillary service endorsements could be used.