USPS
Ancillary Service Endorsement – USPS Definition
A specified marking (wording) on the address side of a mailpiece added by a mailer to request an Ancillary Service that directs USPS how to handle undeliverable-as-addressed (UAA) mail and provide any corresponding address correction service.
Ancillary Service Endorsement
A specified marking (wording) on the address side of a mailpiece added by a mailer to request an Ancillary Service that directs USPS how to handle undeliverable-as-addressed (UAA) mail and provide any corresponding address correction service.