USPS Certified Mail is a mailing service that provides senders with proof of mailing and delivery. When using Certified Mail, the sender receives a receipt as evidence that the item was sent, and the recipient must sign for the delivery, creating a record of receipt. This service is often used for important documents or legal notices, where proof of delivery is crucial. USPS Certified Mail can also be combined with other services, such as return receipt, to provide even more detailed tracking and confirmation of delivery.
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