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Certified Mail provides the sender with proof of mailing and proof of delivery. The service provides electronic verification via email that an article was delivered. The proof of delivery record (copy of the recipient's signature) is kept at the USPS Post Office two years from the date of mailing.

You can request a free 'proof of posting' at the Post Office when you hand over your letter or parcel for posting. You can also obtain a digital proof of posting on the Royal Mail App.

The cost to the public to get a Certificate of Mailing is $1.50.

What is CASS? Coding Accuracy Support System (CASS) is a certification system from the United States Postal Service (USPS) for address validation. A CASS-certified address validation service will standardize your mailing list, update outdated addresses, and verify that addresses are valid and complete.

How much does a certificate of mailing cost? In 2019, a certificate of mailing costs a flat fee of $1.45. In 2020, this fee will increase to $1.50.

A certificate of mailing only proves that mail was shipped on a certain date, but it does not prove or confirm that the mail was delivered. Certified mail provides proof that the mail was shipped AND delivered.

The only way to get a USPS Certificate of Mailing is to go in-person to a post office, and fill out the government forms required. You can then purchase a certificate of mailing for packages sent within the US or internationally.

For small to medium volume mailers, it's generally not practical to CASS-certify your own lists in house, since the software to do this typically costs $800 per year or more. It's expensive because it includes a subscription to the USPS national address data base, which has about 30 million entries.

Use a Certificate of Mailing. Certificate of Mailing service provides a postmarked mailing receipt as evidence that your item was mailed. This is all you need to do: Complete PS Form 3817 at the time of mailing.

To achieve CASS? certification, participants must pass with a minimum score of 98.5 percent for ZIP + 4, carrier route, Five-Digit ZIP and LACSLink, 100 percent for delivery point coding, eLOT, DPV or DSF2, RDI and Perfect Address. CASS? certification is valid until the end of the current certification period.