Which service allows tracking from the original shipment to the final delivery?

The service that allows tracking from the original shipment to the final delivery is Priority Mail Express. This service is designed to provide expedited shipping and includes detailed tracking features. Customers can see the journey of their package from the moment it is shipped until it reaches its final destination. This comprehensive tracking is a significant advantage, particularly for time-sensitive documents and packages, ensuring peace of mind for senders and recipients alike.

While other services like Priority Mail also offer tracking capabilities, they may not include the same level of speed and reliability as Priority Mail Express, which guarantees overnight delivery in most cases. First-Class Mail, though it has tracking for certain items, generally does not include the same robust tracking features and speed. Media Mail, primarily for educational materials, does not include tracking at all. Therefore, Priority Mail Express is the best choice for those needing full tracking assurance throughout the shipping process.