> Not sure what mailer he is using. Its a yahoo mail account. That appears to account for the unusual header elements and for the presence of an HTML alternative. I tried sending myself a test message from a Yahoo! account I keep handy in case I need it. The result appears below my signature. I don't know why those extra blank lines were added, but it definitely happened when I copied the data into my mail client (Outlook Express); they don't appear in a Notepad-saved copy of the message source. Hal Keen Received: from web37511.mail.mud.yahoo.com ([209.191.91.158]) by att.net (sccwmxc02) with SMTP id <20070817190214s0200j384ue>; Fri, 17 Aug 2007 19:02:14 +0000 X-Originating-IP: [209.191.91.158] Received: (qmail 35950 invoked by uid 60001); 17 Aug 2007 19:02:13 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:Date:From:Subject:To:MIME-Version:Content-Type:Conten t-Transfer-Encoding:Message-ID; b=K9CLgqZVvJF0OvJNVFaVwjrxVEtx5CYeOTm5W5V0Krv9E60BYXlBYzS9r5P/9799ENUJFoKNWD Pi2vCWnqqhuhvWGK25N/QNOCjgCoDDB9TeL+poFzk+OQ5tTCsLpN3AzsyOyoUUVaeqbF7jSNxRuJ YhN4j6EWSNqc5iRC0VLRk=; X-YMail-OSG: xA5HAvkVM1mDgFnNohO2_G4eYIb80eGq1QAGTOuyxToZSljpPlLNeIAU09I4uwU_qi6fNZ6e_73L GEUsqkITWRKp0OilxmZpYdHfjOlwI5NY4NlXZXS4.EU0tl5g7A-- Received: from [12.73.133.14] by web37511.mail.mud.yahoo.com via HTTP; Fri, 17 Aug 2007 12:02:13 PDT Date: Fri, 17 Aug 2007 12:02:13 -0700 (PDT) From: Hal Keen <[log in to unmask]> Subject: curiouser and curiouser To: [log in to unmask] MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-306616803-1187377333=:35642" Content-Transfer-Encoding: 8bit Message-ID: <[log in to unmask]> --0-306616803-1187377333=:35642 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit The porpoise of this message is to see what's in the header. --------------------------------- Shape Yahoo! in your own image. Join our Network Research Panel today! --0-306616803-1187377333=:35642 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: 8bit <div>The porpoise of this message is to see what's in the header.</div> <div> </div><p>  <hr size=1>Shape Yahoo! in your own image. <a href="http://us.rd.yahoo.com/evt=48517/*http://surveylink.yahoo.com/gmrs/yah oo_panel_invite.asp?a=7">Join our Network Research Panel today!</a> --0-306616803-1187377333=:35642--