A Certificate of Mailing provides proof that you sent an item when you say you did. This official record shows the date on which your mail was presented to the USPS for mailing.
A Certificate of Mailing must be obtained at the time of the mailing at the Post Office. Use USPS Form 3817 or Form 3877.
Due to this being a record of when you turned the mail piece over to the Post Office, it cannot be performed on any Pitney Bowes meter or software.
Note: These forms may require postage to be affixed to the form itself. You cannot use a meter to print postage directly onto the form. You must print the postage onto a tape, then affix the tape to the form.