The cost to obtain a Certificate of Maling is $2.00 per mailpiece, however, if a customer prepares a USPS form 3665 manifest, the cost is only $.58 per mailpiece. That's a savings of $1.42 per mailpiece by generating PS form 3665 instead of paying individually for each mailpiece.

A Certificate of Mailing is a document that proves that an item was mailed. This is considered an official record, and it can help you prove that an item was sent if someone is disputing the shipment or date sent. USPS Form 3665 is used for multiple pieces in a single order or mailing. The form allows mailers to list multiple items being mailed and ensure that all items are accounted for with a proper acceptance for the mailing date. The form then becomes the receipt, as with all forms. It can be used for international or domestic orders.

How Does A USPS Certificate Of Mailing Work?
A USPS certificate of mailing confirms the date that the mail was accepted for sending. This does not confirm delivery or guarantee that an item will be delivered at a certain date. It only verifies the send date. The USPS doesn’t keep copies of these certificates, but they can be used for domestic or international mail. When you fill out this form, you will keep a copy for your records, along with your receipt for the postage. That is the proof that you mailed the associated letters on the specified date.

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