www.usps.com/ncsc/products/ancillary.htm
Ancillary Ancillary Service Endorsements Undeliverable-as-addressed UAA mail is forwarded, returned to sender, or treated as dead mail depending upon authorization for the particular mail class. An ancillary service endorsement is used to instruct the Postal Service regarding the mailpieces appropriate disposition upon determining that it is UAA. On First-Class Mail, the following endorsements may be used as an updating method to meet the move update standard: Return Service Requested . If UAA, the mailpiece is returned with the new address or reason for nondelivery;
This endorsement option is available for First-Class Mail only when used in conjunction with electronic Address Change Service ACS . Ancillary service endorsements allow the sender to obtain or request provided the appropriate endorsement is used the addressees new forwarding address if the addressee filed a Change-of-Address Order with the Postal Service or the reason for nondelivery. These endorsements also provide the Postal Service with instructions regarding the disposition of UAA mail. These new endorsements provide a simpler and more consistant system than the previous endorsements.
Optional Ancillary Service Endorsement Locations In addition to the current location under the return address 1, ancillary service endorsements may be placed above the delivery address block 2, to the left of the postage area 3, or below the postage area 4 postage stamps, meter stamps, or permit imprints.
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