A mail carrier is also referred to as a mailman, mailwoman, mailperson, postal carrier, postman, postwoman, postperson, letter carrier (in American English), or colloquially postie (in Australia, Canada, New Zealand, and 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.

Source: Wikipedia