National Post Day: How does the 6-digit PIN code system work and what are 9 postal zones of India?

National Post Day is observed in India every year on October 10. It is observed every year to pay tributes to the Indian Postal Department f...

National Post Day is observed in India every year on October 10. It is observed every year to pay tributes to the Indian Postal Department for the crucial role it is playing in India's development and growth journey, and for helping people connect. 

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