422 Unpaid Mail

422.1 With Return Address

Return all unpaid mail with return address to the sender. Imprint with stock rubber stamp R–1300–230, Returned For…Additional Postage. Enter the amount of the deficiency.

422.2 No Return Address

422.21 First-Class Mail International and Postcards

Unpaid First-Class Mail International and postcards with no return address must be forwarded to the appropriate exchange office. Endorse item with stock rubber stamp R–1300–4, Postage Due…Cents. Do not enter the amount of the deficiency.

422.22 Other Unpaid Mail

All other unpaid mail with no return address must be sent to the appropriate mail recovery center.