A mail handler assistant performs a variety of duties related to loading and unloading mail deliveries. In this career, you process parcels and letters, sort them for delivery, and maintain postal worker equipment, such as mail bags or delivery boxes that go on delivery trucks. Qualifications for the job include a mix of career experience and skills. You should have a high school diploma or GED certificate, the ability to follow directions closely, a keen eye for organization and detail, and physical stamina.