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312 Bulk Quantities Certificate of Mailing - Postal Explorer - USPS

312 Bulk Quantities Certificate of Mailing - Postal Explorer - USPS 2026

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The document outlines the procedures and requirements for obtaining a Certificate of Bulk Mailing for international mail. It details the necessary postage payment methods, the conditions under which the certificate is applicable, and instructions for completing and submitting the PS Form 3606 at a Post Office. The certificate verifies the number of identical-weight mailpieces but does not confirm mailing to specific addresses or provide delivery records.

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Click ‘Get Form’ to open it in the editor.
Begin by affixing the appropriate postage in the designated area. You can use meter, PC Postage, or uncanceled postage stamps to cover the total fee due.
Fill in the 'Number of Identical Weight Pieces' and specify the 'Class of Mail' for your bulk mailing.
Indicate the 'Total Number of Pounds Mailed For' and calculate the 'Total Postage Paid for Mailpieces'. Ensure accuracy as this information is crucial for processing.
If using a Permit Imprint for payment, enter your PostalOne! Transaction Number in the appropriate field.
Once completed, present your form at a Post Office facility. If mailing 50 or more items or weighing over 50 pounds, visit a Bulk Mail Entry Unit.

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