IP from email
here I'll show an example of what i was a little confused about
Received: from 7x.4x.6x.1x (EHLO smtp02.atlngahp.sys.xxxx.net) (7x.4x.6x.1x) by mta560.mail.mud.yahoo.com with SMTP; Fri, 02 May 2008 10:50:16 -0700
Received: from mail1.xxxxxxx.local (7x.4x.5x.9x.nw.xxxx.net [7x.4x.5x.9x]) by smtp02.atlngahp.sys.xxxx.net (8.13.1/8.13.1) with SMTP id m42HoBbB022972
for <xxx@yahoo.com>; Fri, 2 May 2008 13:50:11 -0400
Received: from ssk1.xxxxxxx.local (unknown [172.16.0.101]) by mail1.xxxxxxx.local (Symantec Mail Security) with ESMTP id 57268140A for <xxx@yahoo.com>; Fri, 2 May 2008 13:50:11 -0400 (EDT)
Received: from MHxxxx01 ([172.16.0.162]) by ssk1.xxxxxxx.local with Microsoft SMTPSVC(6.0.3790.3959); Fri, 2 May 2008 13:51:15 -0400
after sorting out a few things I think 7x.4x.5x.9x is the actual IP, and the 172.16.0.101 is a VPN tunnel into their network
tell me what you think or if i'm wrong
As I told you in PM CJ, The first one is the ISP's mail server. The second one is the senders IP that was assigned to their Modem (I think this is DSL) the IP would be the send address that the mail server received it from then passed it on to yahoo mail server.
If you want to know more let me know.
thanks again for the help aldarhawk, I was just showing the example since some one asked to see it.
@OS, i just used yahoo's web mail thru the browser, and selected full headers on the options