It looks like a web page inside the email (within the Earthlink mailbox software). Source to follow:
X-McAfeeVS-TimeoutProtection: 0
Status: U
Return-Path: <xxxxxx01@pm.sprint.com>
Received: from noehlo.host ([127.0.0.1])
by mx-collie.atl.sa.earthlink.net (EarthLink SMTP Server) with SMTP id 1ibYPk13l3Nl36t3; Fri, 20 Jul 2007 16:11:50 -0400 (EDT)
Received: from smtp03.sun3.lightsurf.net ([63.215.195.69])
by mx-collie.atl.sa.earthlink.net (EarthLink SMTP Server) with ESMTP id 1ibYPj52M3Nl36t1
for <email@email.com>; Fri, 20 Jul 2007 16:11:49 -0400 (EDT)
Received: from pcs-nams002 (smtp.sun3.lightsurf.net [10.0.1.131])
by smtp03.sun3.lightsurf.net (8.12.11.20060308/8.12.11) with ESMTP id l6KKBHjW019810
for <xxxxxxk@earthlink.net>; Fri, 20 Jul 2007 13:11:49 -0700
Date: Fri, 20 Jul 2007 13:11:49 -0700
Message-ID: <33375218.1184962309659.JavaMail.lsadm@pcs-nams002>
From: "xxxx01@pm.sprint.com" <email@email.com>
To: xxxxxk@earthlink.net
Subject: A Picture Share!
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_Part_63683_17113608.1184962309658"
X-Priority: 3
X-MSMail-Priority: Normal
Importance: Normal
X-ELNK-AV: 0
X-ELNK-Info: sbv=0; sbrc=.0; sbf=00; sbw=000;
------=_Part_63683_17113608.1184962309658
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
You have new Picture Mail!
Click Go/View to see now.
http://pictures.sprintpcs.com/?mivt=NEqrJUJ5m8awcUcLo7qL&shareName=MMS
_frsthgl
------=_Part_63683_17113608.1184962309658
Content-Type: text/html
Content-Transfer-Encoding: 7bit
<html>
<head><title>You have new Picture Mail!</title>
<!-- lsPictureMail-Share-NEqrJUJ5m8awcUcLo7qL-comment
<?xml version="1.0" encoding="UTF-8"?>
<shareMessage>
<messageContents type="PICTURE">
<messageText>An apple a day...</messageText>
<mediaItems>
<mediaItem id="1">
<title></title>
&lt;url&gt;http://pictures.sprintpcs.com/getMMBOXMessageMedia?id=Xw1004H8sLv6S3x76lVPYmsnJP2O20g3QtSDfap6T3pfSqgxmdVV4gmk5gW%2FZUWGmojEaNnHPwvc%0AKwcjgrBjD2m%2BOFMhXxzbXLCAoY2pTf8Bz7HPVhfw5AebITvfl1HKaE%2FneoP%2BjDmbsKmQbUe5kg%3D%3D%0A&lt;/url&gt;
<urlExpiration>2007-07-27T20:11:49Z</urlExpiration>
</mediaItem>
</mediaItems>
</messageContents>
</shareMessage>
-->
<!-- lsPictureMail-UserInfo-NEqrJUJ5m8awcUcLo7qL-comment
<?xml version="1.0" encoding="UTF-8"?>
<UserInfo timestamp="2007-07-20T20:11:49.653+00:00" originating_from_address="mdando01@pm.sprint.com"><credential name="MDN">2024870663</credential></UserInfo>
-->
</head>
<body marginheight="0" marginwidth="0" topmargin="0" bottommargin="0" leftmargin="0" rightmargin="0">
<table border="0" width="100%" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF" >
<tr>
<td VALIGN="top" colspan="2" width="100%">
<table border="0" cellpadding="0" cellspacing="0" width="100%" bgcolor="#FFE100">
<tr>
<td><a href="http://www.sprintpcs.com"><img src="http://pictures.sprintpcs.com/retailers/PCSNEXTEL/images/logos/togetherWithNextel.gif" alt="" border="0" /></a></td>
</tr>
</table>
</td>
</tr>
<tr>
<td VALIGN="top" colspan="2">
<table border="0" cellpadding="0" cellspacing="0" width="590" bgcolor="#FFFFFF">
<tr>
<td><br/><p><img src="http://pictures.sprintpcs.com/images/x.gif" border="0" width="10"/><font face="trebuchet ms, Helvetica, Arial, Verdana" size="2"><b>You have a Picture Mail from example@example.com</b></font><br/><br/></p></td>
</tr>
</table>
</td>
</tr>
<tr>
<td colspan="2">
<table border="0" width="590" cellpadding="0" cellspacing="0">
<tr>
<td width="10"> </td>
<td width="280" valign="top">
<table border="0" cellpadding="0" style="border:1px solid #9C9A9C;">
<tr>
<td>
<table border="0" bgcolor="#ffffff" cellpadding="0" cellspacing="7" style="table-layout:fixed">
<tr>
<td align="center">
<img src="http://pictures.sprintpcs.com//mmps/RECIPIENT/001_266db848d2ff0ca3_1/2.2?inviteToken=NEqrJUJ5m8awcUcLo7qL&limitsize=258,258&outquality=90&squareoutput=255,255,255&ext=.jpg&iconifyVideo=true&wm=1"/>
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
<td width="20"> </td>
<td VALIGN="top" align="right" width="280">
(more followed but was too much for this posting)