It's possible that the issue is with your internet browser. If you're on a desktop or laptop, make sure you're using a Yahoo-compatible browser — either Firefox, Chrome, Safari, or Edge — and that your browser has installed its most recent update. There might also be an issue with your internet connection. If Yahoo Mail Won’t Load Emails, then try running a speed test, and check to see if other websites are just as slow. If they are, get closer to your router, or try resetting it. Clearing your internet browser's cache may help as well. If you're using a mobile device, make sure you're using the Yahoo Mail app and that it has the most recent update installed.