Depending on which station you want to send mail to, you can obtain the military postal service address from the recipient. Generally, service is provided by the Air/Army Post Office™ or the Fleet Post Office.
For example, McMurdo Station in Antarctica, which is run by the National Science Foundation and supported by the US Military, has a military designated zip code, which changes annually. All NSF stations research stations there supported by the government of the United States have their own, annually-designated postal assignments. Technically, you are posting to a military base: APO-Army Post Office; AP-Armed Forces Pacific. Service is for any temporary scientist or worker in support of science, whether military or civilian. The mail transits through New Zealand where it is transferred to Antarctica via US Military C-17 transport/cargo planes. Other countries have their own mail and postal designations for their stations on the continent.
Mail usually arrives either by airplane or by ship, depending on the research station's location.
Your return address in Antarctica is based on the logistical operation of mail in your research station. Your station manager can give you the proper return address for your mail.
Telephone, Email, Snail Mail.
There is no ownership of an 'Antarctica post office'. Each research station organizes the logistics of sending and receiving mail.
First Class mail is delivered in three to five days.
Your answer depends on the 'stuff' and where in Antarctica you propose to send it. Every research station has mail service delivered by the government funding the station. That nation's postal service may define the 'stuff' limits that you can send to your correspondent on the continent.
American Letter Mail Company was created in 1844.
First Class Mail is delivered in three to five days.
First Class Mail is delivered in three to five days.
First Class Mail is delivered in three to five days.
First Class Mail is delivered in three to five days.