Which of the following is NOT a responsibility of a mail carrier?

Repairing mail vehicles is not a responsibility of a mail carrier. Mail carriers primarily focus on handling and delivering mail and packages to designated locations. Their key responsibilities include organizing delivery routes to ensure efficiency, delivering mail to both residential and business addresses, and interacting with customers to provide service and address any concerns related to their mail. While they may need to ensure that their delivery vehicles are clean and ready for use, actual mechanical repairs fall outside their job description and are typically handled by specialized maintenance personnel. This division of labor allows mail carriers to concentrate on their core duties related to mail delivery and customer service.