1. first class mail for which proof of delivery is secured but no indemnity value is claimed
2. mail for which a person must sign an official document stating that it has been received
certified mail 例句
英汉例句
certified mail protocol is fair exchange of a message m for a receipt.
认证邮件协议,指一个发送方要将消息m与收方收到的证据进行交换的协议。
if you don「t get a response within about 10 days, call the representative to let them know you」re waiting for a response, and send another letter by certified mail with return receipt requested.