It seems self-evident, if you're like most people, Yahoo Mail isn't your primary email address. The Yahoo phone number has 1.1 billion monthly active subscribers across all services, but only 230 million because of its Yahoo postal service. If you haven't, please read the email associated with your Yahoo account. Even if you've never updated your password for a while, now's the time to update. If you run into any problems, please contact Yahoo! According to the company, the stolen encryption key was encoded and mixed with a program called bcrypt.