Check your blocked address list. It's possible that one reason you aren't receiving emails from a particular recipient is that you've blocked their address, whether intentionally or not. To check for blocked emails, or to fix Yahoo mail not getting emails, go to the Security and Privacy section of your settings. Send yourself an email. Even if you can access your Yahoo Mail account, it doesn't mean the service is working correctly. One way to see if the delivery system is functioning is to send an email to your account and see if it reaches the inbox.