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Certified mail is a service offered by the Postal Service that provides proof of mailing and delivery. When you combine certified mail with additional services, it enhances the overall security and tracking of important or sensitive correspondence. A return receipt provides proof of delivery, showing who received the mail and when, making it invaluable for legal or important documents. Restricted delivery allows the sender to control who can receive the mail, ensuring that only designated individuals have access to it.

Combining certified mail with these two services—return receipt and restricted delivery—maximizes the benefits of security and confirmability. While other services like insured mail, priority mail, and media mail have their own unique advantages, they do not provide the same layered security and accountability features that the combination of certified mail with return receipt and restricted delivery does. The primary intent of certified mail is often for important documents, where receipt confirmation and limited delivery are crucial.