PS Form 3665: USPS Certificate of Mailing, Firm

PS Form 3665 PDF Details

The following instructions are for the preparation and use of PS Form 3665, Certificate of Mailing, Firm (including USPS-approved facsimiles).

Sender: enter the name and address of the sender at the top of the form.

Total articles: enter the total number of articles in the proper space at the top of the form.

Identifier: insert a firm-specific identifier or account number if desired.

Retail Post Office: when the mailing has fewer than 50 mailpieces and less than 50 pounds, present the form and mailing at a retail Post Office location.

Business mail: when the mailing has at least 50 mailpieces or at least 50 pounds, present them at a business mail entry unit or USPS-authorized detached mail unit.