Vanuatu Post (www.vanuatu post.vu) has the world’s only underwater post office and volcano-side postbox; waterproof and volcano postcards cost 400VT, and can be posted anywhere in the world. Buy the volcano cards from Tanna’s resorts or in Port Vila and bring them with you up the volcano.
There’s no street postal-delivery service in the country; addresses are PO Box or Private Mail Bag (PMB). There’s a poste restante service in Port Vila. All major centres have post offices. Outer-island mail is delivered to the main islands by plane; add the relevant airport to the address.