I'm afraid you don't understand. The messages in question were purported to be from the "Free Catholic" mailing list; however, an examination of the headers clearly shows that they were not sent by the mailing list, as they (at first) appeared to have been - they were, in fact, forged to make it appear as though they came from the "Free Catholic" mailing list, when they did not. The mails in question were forgeries, plain and simple. It's obvious to anyone with even a modicum of experience with mail servers.
Perhaps you don't understand how SMTP headers work? Or perhaps you'd like to continue discussing people who lie to promote an agenda?
And then let him deny it.