registered mail

American  

noun

1. prepaid first-class mail that has been recorded at a post office prior to delivery for safeguarding against loss, theft, or damage during transmission.

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Etymology

Origin of registered mail

First recorded in 1850–55

Example Sentences

The law requires signature withdrawal notifications be notarized and delivered by hand or registered mail to the secretary of state’s office before the petition is filed and certified.

From Seattle Times

Angelina Gonsalves answered the doorbell to find her longtime letter carrier standing in front of her, with registered mail in his hand.

From Seattle Times

The certificates, along with other official papers, are sent by registered mail to various officials, including the president of the Senate.

From The Guardian

How about a law that says any consumer who cancels a service via registered mail, and who can verify that cancellation with a receipt from the U.S.

From Los Angeles Times

If you can’t find an email address or a way to message someone, send a letter via registered mail and request a receipt showing when or if the company received it.

From New York Times