Nothing, they are just two different words meaning the same thing. However, today they are usually called "letter carriers", since many "mailmen" are women.
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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post one
the difference is...
The difference between a mailman and water is water can be bottled and a mailman can't.
Mail carrier.
In the UK and OZ .........postman
mail carts have no doors
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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mail carrier
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.
between 9am and 5pm
E-mail Compound words for mail: airmail blackmail mailbag mailbomb mailbox mailman