It looks like you might be able to do something that at least helps narrow it down.
There's a message rules section.
Make a rule "If message status--> Unanswer --> move to folder "unanswered.")
Edit. Nevermind. My method won't work. There's only an option for "Forwarded" or "Answered" I suppose maybe you can move all of your "answered" to a folder other than inbox.
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