What should be done to endorse each mail correctly?

To endorse each mail correctly, drawing one line neatly through the previous unit address is the most effective method. This technique clearly indicates that the previous address is no longer valid while ensuring that the information remains legible for reference if needed. It is a straightforward approach that signals to postal workers the need for re-routing without obscuring any of the original address too much.

This method also maintains professionalism and cleanliness in the handling of mail. An endorsement should be clear and unambiguous, and using a single neat line allows the forwarding address to be placed directly next to the crossed-out one, ensuring that all necessary information is available for successful delivery.