> strongest pieces of evidence in favor of the legitimacy of the emails
Well the DNC is pretty open about the fact that they were hacked, and there's implants on their servers, so clearly someone took control on the email server. The presence and accuracy of DKIM headers is solid evidence the emails are from the hackers, but not necessarily of their legitimacy. If they had complete control of the email server, then they would have access to the DKIM's private key, making it trivial to spoof emails.
So yeah, definitely from the email server, but that doesn't necessarily mean it's authentic. Though IMO it's likely authentic, the DNS as far as I know hasn't challenged the authenticity of any emails, and I were forging emails I'd make them a lot more damaging than what we've been given.
Well the DNC is pretty open about the fact that they were hacked, and there's implants on their servers, so clearly someone took control on the email server. The presence and accuracy of DKIM headers is solid evidence the emails are from the hackers, but not necessarily of their legitimacy. If they had complete control of the email server, then they would have access to the DKIM's private key, making it trivial to spoof emails.
So yeah, definitely from the email server, but that doesn't necessarily mean it's authentic. Though IMO it's likely authentic, the DNS as far as I know hasn't challenged the authenticity of any emails, and I were forging emails I'd make them a lot more damaging than what we've been given.