For which of the following types of mail is a street address required?

A street address is required for package deliveries because these items must be physically delivered to a specific location where the recipient is located. This ensures proper routing of the package through the postal system and facilitates accurate delivery to the recipient's residence or business.

In contrast, P.O. Box mail does not require a street address since it is directed to a specific post office box, which serves as the delivery point for that particular recipient. International mail may have specific addressing requirements, but it often still requires either a street address or a designated delivery point in the destination country, depending on the services used. However, package deliveries fundamentally rely on street addresses, making them essential for effective delivery logistics.