Japan Post offers very reasonable rates for sending mail overseas. For full details of services, rates and delivery times, see http://www.post.japanpost.jp/int/index_en.html.

EMS (Express Mail Service) is often used for sending important documents overseas by recorded delivery. If you want to send an EMS or other type of international mail, but you cannot take it to the post office, they can come to pick it up free of charge. This service is called shūka, and it also works for Yu-packs within Japan.