certified mail

Send your information by certified mail with return receipt requested.

Always send this information by certified mail, with a return receipt requested.

You should send your letter by certified mail, and request a return receipt.

The other day we received a notice for certified mail awaiting us at our post office.

And this is from certified mail in which I paid 20 dollars for a relatively small package.

I sent everything they requested by certified mail on May 8.

Many people send their material to us by certified mail, with a return receipt request, but this is not required.

She sent in all her information on Jan. 11, 2006, by certified mail.

She found the new address and resent it, again by certified mail.

He also objected because the letter to his client was not sent by certified mail.