Postman

A mail carrier, mailman, mailwoman, postal carrier, postman, postwoman, or letter carrier (in American English), sometimes colloquially known as a postie (in Australia,New Zealand,Scotland, and other parts of the United Kingdom), is an employee of a post office or postal service, who delivers mail and parcel post to residences and businesses. The term "mail carrier" came to be used as a gender-neutral substitute for "mailman" soon after women began performing the job. In the Royal Mail, the official name changed from "letter carrier" to "postman" in 1883, and "postwoman" has also been used for many years.

In the United States, there are three types of mail carriers: Letter Carriers, who are represented by the National Association of Letter Carriers; Rural Carriers, who are represented by the National Rural Letter Carriers' Association; and Highway Contract Route carriers, who are independent contractors. While union membership is voluntary, city carriers are organized near 70% nationally.

Letter carriers are paid hourly with the potential for overtime. Letter Carriers are also subject to "pivoting" on a daily basis. Pivoting (when a carrier's assigned route will take less than 8 hours to complete, management may "pivot" said carrier to work on another route to fill that carrier up to 8 hours.) is a tool postal management uses to redistribute and eliminate overtime costs, based on consultation with the Carrier about his/her estimated workload for the day and mail volume projections from the DOIS (Delivery Operations Information System) computer program. Routes are adjusted and/ or eliminated based on information (length, time, and overall workload) also controlled by this program, consultations with the carrier assigned to the route, and a current PS Form 3999 (street observation by a postal supervisor to determine accurate times spent on actual delivery of mail). Many carriers object to the fact that average mail volumes used for route adjustments come from DOIS as it is not an actual count of the mail by a person and instead by a machine, leading carriers to question the accuracy of the count.

...
Wikipedia