A mail handler plays a vital role in the postal service by processing and sorting incoming and outgoing mail. This includes manually sorting letters, packages, and parcels based on destination and delivery route. Mail handlers operate sorting machinery to expedite the process and ensure accurate distribution. They may also handle special services such as registered mail or parcels requiring special handling instructions. Additionally, mail handlers may assist with loading and unloading trucks, maintaining mailroom equipment, and adhering to postal service regulations to facilitate timely and efficient mail delivery.