Which of the following is NOT a benefit of Priority Mail Express?

The benefit that is identified as not applicable to Priority Mail Express service is related to weight limits on parcels. Priority Mail Express does have weight limits, which is a standard procedure for most postal services. Specifically, it can accommodate packages weighing up to 70 pounds. This means that customers can send heavier items, but there are clear boundaries on how much weight is allowed.

In contrast, the other options highlight key advantages of the Priority Mail Express service. For instance, this service includes free package tracking, which allows customers to monitor the status and location of their shipments in real time. Additionally, it provides delivery to PO Boxes, making it convenient for individuals who may not have a traditional street address. Furthermore, Priority Mail Express does not impose residence surcharges, which can be a significant cost-saving feature for customers needing fast delivery to residential addresses. Therefore, all these aspects illustrate the strengths of the service, while weight limits highlight a necessary restriction within mailing parameters.