Email headers that wont track

IP's that wont track

I have come across a few email headers that wont track - how do they that?

the following header wont track - can you tell me wher the person is?

From Desjardins Luis Thu Aug 9 22:23:32 2012
X-Apparently-To: [email protected] via 98.138.211.181; Thu, 09 Aug 2012 22:23:36 -0700
Return-Path: <[email protected]>
Received-SPF: none (domain of yahoo.com does not designate permitted sender hosts)
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X-YMailISG: fGNf4XMWLDvmNNVtVfaRdYYkVMaIbZ_tA1ih.nLIzDywoV80
F2h36qTVDXXnrt0Up5wOn2JnzcNGVIZm7FiO6YQWAgp8nO_EBShhme.2cK1m
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ImncrBfzPwBzfEAkVwibNuUCu4YyR2_nJg--
X-Originating-IP: [98.138.91.244]
Authentication-Results: mta1186.mail.bf1.yahoo.com from=yahoo.com; domainkeys=pass (ok); from=yahoo.com; dkim=pass (ok)
Received: from 127.0.0.1 (EHLO nm22-vm5.bullet.mail.ne1.yahoo.com) (98.138.91.244)
by mta1186.mail.bf1.yahoo.com with SMTP; Thu, 09 Aug 2012 22:23:36 -0700
Received: from [98.138.90.52] by nm22.bullet.mail.ne1.yahoo.com with NNFMP; 10 Aug 2012 05:23:34 -0000
Received: from [98.138.226.165] by tm5.bullet.mail.ne1.yahoo.com with NNFMP; 10 Aug 2012 05:23:33 -0000
Received: from [127.0.0.1] by omp1066.mail.ne1.yahoo.com with NNFMP; 10 Aug 2012 05:23:33 -0000
X-Yahoo-Newman-Property: ymail-5
X-Yahoo-Newman-Id: [email protected]
Received: (qmail 53017 invoked by uid 60001); 10 Aug 2012 05:23:33 -0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1344576213; bh=aa55ZxuUr2UdreUcx0n61zIANqTKgQZx0r0DsSoS13I=; h=X-YMail-OSG:Received:X-Mailer:Message-ID:Date:From:Reply-To:Subject:To:MIME-Version:Content-Type; b=fYAUo3HrylO2OIO8HaKQpgBXMweelcrPQfDmmJHzjZbiEmOMpn15A8ZNvk0dh8InQbSqpDJMmp37bwQMSrdx8OvfC94kf5SJc0aHDAeSQqwqU7LGUuW1m9rzktzeStu6iNzrDs3DvvvNN9kCXlPtSlxBV84da1e+8WtuaS0V4eg=
DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws;
s=s1024; d=yahoo.com;
h=X-YMail-OSG:Received:X-Mailer:Message-ID:Date:From:Reply-To:Subject:To:MIME-Version:Content-Type;
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X-YMail-OSG: zZt7QesVM1lwZzp35mfScjWxvWAwfTruI3U85BdrYvtOuTf
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Ywr0zrRk-
Received: from [50.117.0.46] by web122205.mail.ne1.yahoo.com via HTTP; Thu, 09 Aug 2012 22:23:32 PDT
X-Mailer: YahooMailWebService/0.8.120.356233
Message-ID: <[email protected]>
Date: Thu, 9 Aug 2012 22:23:32 -0700 (PDT)
From: Desjardins Luis <[email protected]>
Reply-To: Desjardins Luis <[email protected]>
Subject: Hello
To: "[email protected]" <[email protected]>
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="-1522790894-1760490537-1344576212=:42626"
Content-Length: 324801

This is the key line in the headers

Received: from [98.138.90.52] by nm22.bullet.mail.ne1.yahoo.com with NNFMP

NNFMP is a little-understood mailing protocol, frequently associated with scammers and spammers. When it is present, those headers are often forged. Unfortunately, in a case like this one, the originating IP has been stripped or modified, and there is no way to use this header to get a location.