

PS Form 3877, Firm Mailing Book for Accountable Mail, which can be used for international mail when mailing three or more individual pieces.PS Form 3665, Certificate of Mailing - Firm (Domestic), which can be used for three or more pieces that include the sender’s address and the return address of each item listed.PS Form 3606, Certificate of Bulk Mailing - International, which can be used for international mailings of identical-weight pieces.PS Form 3606-D, Certificate of Bulk Mailing - Domestic, which can be used for domestic mailings of identical-weight pieces.Available for Priority Mail, First-Class Mail, USPS Retail Ground, Media Mail, Library Mail, Bound Printed Matter*, unregistered Priority Mail International Flat Rate Envelopes and Small Flat Rate Boxes, unregistered First-Class Mail International items, unregistered First-Class Package International Service items, and Airmail M-Bags.

Complete PS Form 3817 at the time of mailing.Getting Evidence You Sent It Certificate of Mailingĭo you need evidence to show that your letter or package was mailed? Use a Certificate of Mailing.Ĭertificate of Mailing service provides a postmarked mailing receipt as evidence that your item was mailed.
