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Many of the emails were proven authentic via DKIM signatures.

I searched and found no credible source supporting this claim. Do you know of one?

Wikileaks makes the claim, and some very partisan sources repeat it, but that's all I see.

You can check the headers yourself.

It's not realistic for me to figure out DKIM and verify thousands of headers.

Also, for other people, I'm not a credible source. Is there one?