I still don't know why companies insist on only accepting a specific address format. As they said, every country has its own format: some with the house number in front of the street, other afterwards; some with a province, others not; etc.

A simple text box is so much simpler (enforce things like max width, max lines) and relies on the customer inputting their info corresponding to their local postal delivery. In an international context this is the right way.

Edit: the only thing that must be localized in the sender's locale is the recipient's country (Spain instead of España when sending from an English speaking country). Every thing else must be in the recipient's locale.