Sometimes due to an unexpected shutdown, Yahoo mail might get corrupt and lead to the issue of Yahoo mail not updating on Mac issue. To troubleshoot the issue, check out the steps to resolve it. Start by opening Mac mail and tap on the menu, and choose the mail option. After that, choose the preferences as an option and choose the Yahoo mail account that you want to remove or which is not running correctly. Now, tap to OK button to remove the account. When your account is removed from Yahoo mail then add the account again. It should troubleshoot the issue but if not, then users can also check out the manual properly.