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Expired domain 404 crawl error
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I recently purchased a Expired domain from auction and after I started my new site on it, I am noticing 500+ "not found" errors in Google Webmaster Tools, which are generating from the previous owner's contents.Should I use a redirection plugin to redirect those non-exist posts to any new post(s) of my site? or I should use a 301 redirect? or I should leave them just as it is without taking further action? Please advise.
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If the content isn't there, you can setup a 410. That will tell the search engines and users that the pages are gone for good. GWT will also show broken links to your site as well. So you will want to distinguish between the inbound 404s and the pages that are no longer there.
There's a possibility that the pages have been gone for so long, they're no longer indexed. So I'm not really sure how much good a 301 will do from a link perspective. However, if you have access to referral data - you may find some of those inbound 404s are worth redirecting to a relevant page.
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