Close out one site; move seeker to the new one

Is there a simple quick way to create a 401 (or is it 404) page to move people from my old site (which I’m closing) to my new one? Obviously I’ll be emailing my original list to inform them, but it’s the people who are out browsing that I’m concerned about. I don’t want to lose them

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Close out one site; move seeker to the new one