The most common reasons for Yahoo! Mail not opening include a browser issue, an erroneously entered login or password, or a problem with the Yahoo! servers. To begin, clear the cache and restart the browser page, then double-check that you’re using the proper username and password. If you’re still having problems, you should contact Yahoo! customer service for further assistance.
Users can contact Yahoo! support directly if they are having trouble logging in. On its website, the corporation provides online support as well as telephone support at 1-800-318-0612. Forgotten passwords, accessing email on mobile devices, dealing with closed accounts, restoring settings, and determining if an account has been hacked are all covered in Yahoo! Help.
If clearing the cache does not solve the problem, check to see if the browser has been set to allow Yahoo! to be used. In the address bar of the Firefox browser, type “about:permissions” to change permissions. On the left side of the page, you should see a list of websites. Locate the list of Yahoo! servers and delete the cookies from each one manually. It’s worth noting that cookie removal processes varies between browsers.
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