Registered SAL is one of three types of shipping you can choose for shopping service orders via Tenshishop. However, it is not available to all countries, and starting December 18th, 2017, several new countries stopped accepting SAL. Please check out the following list. Newly added countries are in bold.
Australia, Algeria, Denmark, Finland, France, Germany, Gibraltar, Greenland, Hungary, the Netherlands, Norway, Poland, Spain, Ukraine.
These countries must use Registered Airmail or EMS.