Correo Argentino offers postal service abroad, though it is slow and items are often lost. It is safer to shell out the extra money to use the registered mail to boost chances of a successful delivery of an important letter. For packages, use the courier service at Correo Argentino where a package weighing less than 1kg cost approximately $100. Or find more reliable services from UPS or DHL. It is more of a chore to receive mail from abroad in Argentina. Use a courier-style service to reduce hassle, but should you need to pick up a package go to the international office at Retiro located in Buenos Aires. Be prepared to pay customs duties as well.