USING ENDORSEMENTS
Ancillary service endorsements are used by mailers to request an addressee's new address and to provide the USPS with instructions on how to handle undeliverable pieces. The endorsements consist of one keyword -- "Address," "Forwarding," "Return," or "Change" -- followed by the two words "Service Requested."  
Mailer Endorsement and UPS Action Fees:
Priority Mail and First-Class Mail
Standard Mail (A)
Standard Mail (B)
Address Service Requested (1)
Forwarding and return. New address notification provided.
Months 1 thru 12: mailpiece forwarded; separate notice of new address provided; address correction fee charged. Forwarding: no charge. Forwarding: no charge Forwarded locally: no charge; out of town as postage due.
Months 13 thru 18: mailpiece returned with new address attached. No charge Standard Mail (A) weighted fee charged (2) Return postage charged at appropriate single-piece rate.
After 18 months or if undeliverable: mailpiece returned with reason for nondelivery attached. No charge Standard Mail (A) weighted fee charged (2) Returned if undeliverable or if addressee refused to pay postage due. Forwarding (where attempted) and return postage charged at appropriate single-piece rate.

Forwarding Service Requested
Forwarding and return. New address notification provided only for return.
Months 1 thru 12:
mailpiece forwarded.
No charge No charge Forwarded locally: no charge; out of town as postage due.
Months 13 thru 18: mailpiece returned with new address attached. No charge Standard Mail (A) weighted fee charged. (2) Return postage charged at appropriate single-piece rate.
After 18 months or if undeliverable: mailpiece returned with reason for nondelivery attached. No charge Standard Mail (A) weighted fee charged. (2) Returned if undeliverable or if addressee refused to pay postage due. Forwarding (where attempted) and return postage charged at appropriate single-piece rate.

Return Service Requested
No forwarding, only return. New address notification provided
Mailpiece returned with new address or reason for nondelivery attached. No charge Standard Mail (A) single-piece rate charged. Return postage charged at appropriate single-piece rate.

Change Service Requested

No forwarding or return. New address notification provided.
Separate notice of new address or reason for nondelivery provided; in either case, address correction fee charged; mailpiece disposed of by USPS.  See Footnote 3  See Footnote 1  See Footnote 1

No Endorsement

UAA handled by class of mail Same as USPS action for "Forwarding Service Requested." Mailpiece disposed of by USPS. (No exception for Single-Piece Standard Mail. Single-Piece Standard Mail must be endorsed if forwarding or return is desired) Same as USPS action for "Forwarding Service Requested."

1. Valid for all mailpieces including Address Change Service (ACS) participating mailpieces.

2. Weighted fee is the appropriate Single-Piece Standard Mail (A) rate multiplied by the factor 2,472.

3. Option available only via electronic Address Correction Service (ACS) and only letters and sealed parcels and stamped cards and postcards subclasses. Not available for Priority Mail or mail with special services (e.g. certified or registered mail).