Which service provides a money-back guarantee for timely delivery?

The service that provides a money-back guarantee for timely delivery is Express Mail. This service is designed for customers who need their items to be delivered quickly and reliably, typically overnight or within one to two days. The money-back guarantee means that if the package does not arrive by the specified date and time, the customer is entitled to a refund of the postage costs. This feature of Express Mail helps ensure that important documents and packages are delivered on time, which is crucial for time-sensitive items.

In contrast, other services like Priority Mail and Media Mail do offer reliable delivery options but do not guarantee a refund for delays. Standard Mail, typically used for bulk mailing, is not designed for fast delivery and operates under its own set of rules regarding delivery times and service guarantees. The lack of a money-back guarantee in these services signifies their differing purposes and priorities compared to Express Mail, making Express Mail the only option with that assurance.