[hashtagmarkup]

Because the DKIM keys were not made public, and a message sent from their account could be confirmed to be authentic.

If the keys were public, they could claim forgery. Regardless they could claim their account was hacked, but they couldn't deny the message was sent from their account.

[morelisp]

I'm not asking how the technical mechanism proves the messages may be legitimate. I'm asking how you could use that knowledge in the specific situation you outlined to accomplish anything productive.

[hashtagmarkup]

I'm not the person who said outting people as gay was productive. The other person claimed it could be destructive.