This is the 10295th most frequent German word.
postler
A "postler" is a postal worker or mail carrier.
Here, 'Postler' describes the person currently working as a mail carrier whom the speaker encountered.
Heute habe ich den Postler freundlich begrüßt.
Today, I greeted the postman kindly.
Here, 'Postler' is used in its standard meaning referring to a postal worker or postman performing delivery duties.
Der Postler liefert Briefe und Pakete aus.
The postman delivers letters and packages.
In this sentence, 'Postler' is used to refer to someone's past profession as a postal worker.