When you are sure that you haven’t sent bulk mails, still your account got this temporary error, you need to be a little cautious here. There could be some suspicious motion or hacking attempt on your account. Here, you need to sign in with help of Yahoo account Sign in Helper and get into your account; change the password and inform the account settings with a new one. We recommend here a better security with Yahoo mail Account Key or 2-Step Verification with your account.