Getting Evidence You Sent It - USPS
about.usps.com › publications › pub370PS Form 3877, Firm Mailing Book for Accountable Mail, which can be used for international mail when mailing three or more individual pieces. Note: When requesting a Certificate of Mailing for three or more pieces presented at one time, you may use PS Form 3665 or a currently USPS-approved facsimile, including computer-generated firm sheets.
Proof of Delivery | USPS Office of Inspector General
7.8.2017 · But with proof of mailing and delivery along with strict rules and controls, Registered Mail still appeals to customers who want to send valuable or irreplaceable items through the mail. Registered Mail is a premium service that …
Mailing Your Tax Return | USPS
www.usps.com › taxes › welcomeProof of Mailing. For added peace of mind, you can buy a Certificate of Mailing at the Post Office. If your return is delayed or lost, a Certificate of Mailing is a proof of mailing receipt that proves you mailed your tax return on a certain date. (After you send your taxes, keep your receipt in a safe place.