Each research station handles its own postal needs, and each is country-specific.
There is no Antarctic postal service. Every research station uses its country's postal services, and each station has its own individual postal code.
Your answer depends on the destination in Antarctica and whether or not there is postal service -- which is rather seasonal -- to that destination.
Your answer depends on the service provider who supplies postal service to the location from which you want to send mail. Each research station employs a mail service provider who will dictate postal rates, that vary depending on the destination of the mail.
speed postal service
United States Postal Service
Indian Postal Service was created in 1764.
How do you become a contractor for the US postal service?
United States Postal Service and UPS
The United States Postal Service is abbreviated USPS.
Postal service
United States Postal Service (USPS), FedEx, and UPS are all postal service companies that provide tracking number abilities because the are all delivery service businesses.
Sir Rowland Hill invented the first postal service