If you haven’t been paying attention to your email, Yahoo issued the warning below to their users to change their account passwords. So be sure to do it! NOW!!
The safety of your Yahoo account, [USERNAME], is important.
We’re asking users to change their passwords due to recent security incidents online. While Yahoo systems were not affected, we may take extra precaution and lock user accounts when we detect unusual activity.
Please sign in to Yahoo and change your password.
If you have additional questions about account safety, please visit our Help page or contact us at: https://io.help.yahoo.com/contact.