Japan Post said Monday that it has launched a "digital address" system that links seven-digit combinations of numbers and letters to physical addresses. People can obtain digital addresses by registering with Japan Post's Yu ID membership service. Their digital addresses will not change even if their physical addresses change. With Japan Post opening up a system for obtaining address information using the codes, e-commerce giant Rakuten and others are considering adopting it. Japan Post plans to spend about a decade to promote broad adoption of the new system.