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

Instead of taking her to court, write her a letter and send it certified mail.

From Slate

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

From Seattle Times

A few, but not all of the students and alumni who had come forward to allege misbehavior were alerted by Yale Law School Dean Heather Gerken’s secretary that they would receive a package by certified mail.

From Slate

According to Bluefield Police Chief Dennis Dillow, letters informing a parent that they are being banned from a ballpark have to be hand-delivered or sent by certified mail in order for them to let the recipients know that they could face trespassing charges.

From Washington Times

Some suffering businesses aren’t refusing cancellation requests, but are making things difficult by charging fees to freeze a currently somewhat useless membership—ClassPass will soon make users to fork over $9 a month if they’d like stay paused and hang onto any unused credits—or requiring that people either cancel through “certified mail” or in person, even though we are still in a pandemic.

From Slate