I'm a tech idiot - can someone who has been here a while tell me whether these messages are credible RE: their authenticity?
I haven't been here long but according to what I have read as long as the email header information is intact (which not all of them are) then the email authenticity can be verified.
Here is what I got when I ran the email from pastebin through the DKIM verifier:

Tried several different ways and got the same result every time. I am sure it is possible I did not do it correctly though, perhaps someone else can try?