Which of the following services cannot have delivery confirmation?

Standard Mail does not offer delivery confirmation because it is primarily meant for bulk mailings where tracking is not essential. This type of mail is generally used for advertisements, circulars, and other items that do not require immediate or confirmed delivery.

In contrast, Express Mail, Priority Mail, and Certified Mail are services that come with more stringent tracking and confirmation features. Express Mail is designed for urgent shipments and offers guaranteed delivery times along with tracking. Priority Mail provides trackable service options and often includes delivery confirmation as part of the service. Certified Mail provides proof of mailing, tracking, and a signature upon delivery, making it suitable for important documents.

Thus, Standard Mail stands out as the service among the options that does not incorporate delivery confirmation capabilities.