Certificate of Mailing
Do you need evidence to show that your letter or package was mailed? Use a Certificate of Mailing.
- PS Form 3606-D, Certificate of Bulk Mailing — Domestic, which can be used for domestic mailings of identical-weight pieces.
- PS Form 3606, Certificate of Bulk Mailing — International, which can be used for international mailings of identical-weight 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 3877, Firm Mailing Book for Accountable Mail, which can be used for international mail when mailing three or more individual pieces.
- When the mailing has fewer than 50 mailpieces and less than 50 pounds, present the form and mailing at a retail Post Office location.
- When the mailing has at least 50 mailpieces or at least 50 pounds, present the form and mailing at a business mail entry unit (BMEU) or USPS-authorized detached mail unit (DMU).