What address is that of the true originator of the message?

The follows is an email header. What address is that of the true originator of the message? Return-Path:

Received: from smtp.com (fw.emumail.com [215.52.220.122]. by raq-221-181.ev1.net (8.10.2/8.10.2. with ESMTP id h78NIn404807 for ; Sat, 9 Aug 2003 18:18:50 -0500 Received:
(qmail 12685 invoked from network.; 8 Aug 2003 23:25:25 -0000 Received: from ([19.25.19.10]. by smtp.com with SMTP Received: from unknown (HELO CHRISLAPTOP. (168.150.84.123. by localhost with SMTP; 8 Aug 2003 23:25:01 -0000 From: “Bill Gates” To: “mikeg” Subject: We need your help! Date: Fri, 8 Aug 2003 19:12:28 -0400 Message-ID:
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A.
19.25.19.10

B.
51.32.123.21

C.
168.150.84.123

D.
215.52.220.122

E.
8.10.2/8.10.2