Have MacBook Pro - Where do I fix problem with Mail Inbox posting duplicate messages?

Messages appearing in my inbox are coming in duplicates, and when I delete one it deletes both.  Looked in Preferences but can't see anything to fix this.  Thanks for any help

I don't know what the solution is, but I've seen this posted before.  Just search the forums for "email with 1969 date" and you might find a solution.

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