Where should markings be placed when requesting special services for mail according to ADO guidelines?

The correct placement of markings when requesting special services for mail according to ADO guidelines is above the address and to the right of the return address. This position ensures that the markings are visible and easily identifiable by postal workers handling the mail. When the markings are placed in this specific area, it helps to ensure that the mail is processed correctly and efficiently, minimizing delays or misunderstandings regarding the nature of the service requested.

This particular location also allows for a consistent standard that postal services can rely on, improving overall communication and logistics within mail processing. Markings placed elsewhere, such as the bottom of the envelope, to the left of the recipient's address, or on the back of the envelope, could be less visible or incorrectly interpreted, potentially leading to improper handling of the mail. It is crucial to adhere to these guidelines to ensure that special service requests are honored as intended.