Customers can purchase a certificate of mailing when they send unregistered First-Class Mail International, postcards or postal cards, free matter for the blind, and uninsured Priority Mail International parcels. To obtain an additional certificate after mailing, the mailer must present the original certificate and an additional certificate endorsed “Duplicate” or a copy showing the original dates of mailing. The additional certificate must be postmarked to show the current date. A certificate of mailing cannot be obtained in combination with registered mail, insured parcels, or bulk mailings of 200 pieces or more that bear a permit imprint.
