Just like to say a good word for the Argentine postal service.

Since moving here I have been receiving my redirected mail from the UK without any problems amongst which has included Credit Card renewals which must have been obvious to the handlers who delivered them. I have also posted mail back to the UK and all have arrived safely, so a big ^ to the Correo.

Having said that and I would say the same for any country it would be wiser to send using the usual FedEx or whoever just for tracking purposes.