employee of the post office or postal service, who delivers mail to residences and businesses

A mailman or mail carrier or postman is a person who brings people their postal mail. Normally he works for the post office of the respective country. Of course, there are also women doing this job. They are called mailwomen. For a layman, this occupation is called "letter carriers".

Postcard depicting a Russian Empire mailman, with an inscription in Russian "Hello from Kharkov"

Fictional mailmen are traditionally shown as acting afraid of dogs, even to the point of shock.