The Certificate of Mailing is a form supplied by the USPS and is downloadable from their websitel It allows for 8 names and addresses per page and the charge is $0.90 per page. Every time I go to the postoffice I bring a filled out form with me. It has an entry for every item I'm mailing. Sometimes I have one sheet or I may have 10 sheets. It all depends on the amount of itemsgeing mailed.

I downloaded mine and then cusomized it with name etc. and made it possible to cut and past info into it. I cut and paste the info into it just before I print the shipping label

Works great - the original idea was when I had people saying they never got my package. I can then email them a copy showing their invoice number, name and address and date of mailing.

But it has evolved into additinal uses since then.

You can dowload the form at: http://www.usps.com/forms/_pdf/ps3877.pdf

Garry