On Sun, 4 Oct 2009 16:21:40 -0700, Bud wrote:

Small home network, Win XP, IE 7, OE 6, all updates

Have received email from two different people. Each has it's own distinct
email address, but both have the same IP Address in their "Message Source".

Is there a way to tell if both these messages came from the same computer?
Can't locate any guidance on the Internet.

Not unless the email went through a local server. I have four computers
running behind a router. The only IP address you would see (normally) is the
IP address of the router because that is the IP address the SMTP message
submission server I normally use sees. On some rare occasions, I use an SMTP
message submission server built into the Windows XP MCE 2005 OS; and, in
that case, that server will stamp the computer IP address in its headers.

--
Norman
~Oh Lord, why have you come
~To Konnyu, with the Lion and the Drum