How do they blank out IP addresses etc?

From: John Perry (JohnPerry@redoak.co.ukNOSPAM)
Date: 01/27/02


From: John Perry <JohnPerry@redoak.co.ukNOSPAM>
Date: Sun, 27 Jan 2002 20:34:22 +0000

I received this HTML mail from a hotmail user but I've changed my email
to zzzz and the originator to yyyy.

How did he do this? No originating IP address and no audit trail at
all. Any tips guys?

MIME-Version: 1.0
Content-Type: multipart/alternative;
        boundary="----_=_NextPart_003_01BOAKAT.8D5BF46A"
Subject: =?windows-1252?Q?New msg ?=
Date: Fri, 25 Jan 2002 11:13:00 PST
From: yyyy@hotmail.com
To: zzzz@hotmail.com
X-Originating-IP: []

This is a multi-part message in MIME format.

------_=_NextPart_003_01BOAKAT.8D5BF46A
Content-Type: text/plain; charset="windows-1252"
Content-Transfer-Encoding: quoted-printable

hi=2C it

--
John Perry



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