Nothing, they are just two different words meaning the same thing. However, today they are usually called "letter carriers", since many "mailmen" are women.
You can say, "The mailman knows how to deliver mail." This implies that the mailman is skilled and experienced in the process of sorting and delivering mail to the correct addresses. Alternatively, you could phrase it as "The mailman is trained in delivering mail."
The postman is 'le facteur' (masc.) or 'la factrice' (fem., the postwoman) in French. The postman always rings twice: le facteur sonne toujours deux fois.
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The difference between a mailman and water is water can be bottled and a mailman can't.
Mailman.
In the UK and OZ .........postman
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Try: a mailman, or mail carrier, or postman, or postal carrier.
"Some Postman" - Presidents of the United States of America.
Someone who delivers mail is called a mailman/mail woman or mail carrier.
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The children's book you are referring to is likely "The Jolly Postman" by Janet and Allan Ahlberg. The book follows the daily life of a postman as he delivers mail to various fairy-tale characters. It includes interactive elements such as removable letters and a fold-out map of the postman's route.
E-mail Compound words for mail: airmail blackmail mailbag mailbomb mailbox mailman
between 9am and 5pm
In the United States, the postman is commonly referred to as the "mailman." This term is used for both male and female postal workers, though "mail carrier" is also increasingly popular as a gender-neutral alternative. The U.S. Postal Service employs these individuals to deliver mail and packages to homes and businesses.