2) Comment as to the authenticity of Clarity's emails to Z2."
1) Well, you can't send a FReepmail message unless you are logged into the account. The FReepmail database is organized and protected to the point that it would be mighty difficult for an outsider to get to it. I'd say it's as secure we can be reasonably expected make it.
2) Well, I have not compared them word for word, letter for letter to the originals, but from the looks of the ones I've seen, they appear to be authentic.