From: Whomever To: Someone Date: Sat, 10 Oct 2009 00:30:04 +0200 Subject: whatever Content-Type: multipart/mixed; boundary=outer This is a multi-part message in MIME format. --outer Content-Type: multipart/alternative; boundary=inner This is a nested multi-part message in MIME format. --inner Content-Type: text/plain; charset="us-ascii" Hello --inner Content-Type: text/html; charset="us-ascii" Hello --inner-- This is the end of the inner MIME multipart. --outer Content-Type: message/rfc822 From: Someone Else Subject: Hello, this is an elaborate request for you to finally say hello already! Please say Hello --outer-- This is the end of the outer MIME multipart.