certified mail

American  

noun

1. uninsured first-class mail requiring proof of delivery.

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Etymology

Origin of certified mail

First recorded in 1950–55

Example Sentences

If you file on paper, you should ask for a postmark at the post-office counter or choose certified mail with a return receipt.

From The Wall Street Journal • Jan. 26, 2026

Under the terms of his contract, Huggins would have had to submit a letter by registered or certified mail to voluntarily resign.

From Washington Times • Jul. 10, 2023

After a trip to the post office — where she spent $240 sending off dispute letters by certified mail for clients — she realized more money was going out than in.

From New York Times • Jun. 7, 2023

At times, he said, the correspondence was sent by certified mail and the IRS still cannot locate it.

From Seattle Times • Jul. 16, 2021

If you want to know the date that the Copyright Office receives your material, send it by registered or certified mail and request a return receipt.

From Copyright Basics by Library of Congress. Copyright Office