Ancillary Service Endorsement

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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 ?
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.
Prior to a decision to implement the electronic mailing list correction version of FASTforward[SM], such firms may utilize ancillary service endorsements or Address Change Service if they wish to maintain the ability to achieve First-Class presort and automation discounts.