If your Yahoo Mail is not marking unread email as read after checking them please checking your Viewing Email settings:
If that does not fix the problem please see this guide for resolving software conflicts between your computer and Yahoo Mail:
How to troubleshoot Yahoo Mail accounts with connection problems and browser timeouts
If that does not fix the problem please see this guide for resolving software conflicts between your computer and Yahoo Mail:
How to troubleshoot Yahoo Mail accounts with connection problems and browser timeouts
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