Can delivery confirmation be added to a certified letter?

Delivery confirmation cannot be added to a certified letter because certified mail itself already includes a tracking component that provides detailed information about the delivery status. When a certified letter is sent, it is tracked through the USPS system, allowing the sender to receive updates regarding its delivery and the recipient's signature confirmation when the letter is delivered. This built-in tracking feature makes the addition of delivery confirmation redundant, as certified mail inherently serves the purpose of providing proof of delivery.

While some other mailing options might allow for additional services, the nature of certified mail means that it does not require or permit the addition of separate delivery confirmation services.