Just for people saying that sitemails can't be used as proof:
That's true in the context of people just copying and pasting the text versions of them. Of course that data could be edited.
What you guys should be doing when trying to use a sitemail as some form of "evidence" or whatever in this debatable witch hunt is taking a screenshot of the sitemail opened on your browser. It is read-only at that point and, without the use of photoshop (which can typically be determined), should prove who the sender was, the time it was sent, the message, recipient, etc.