 <p>As the forum post you point to says, Attachments aren't implemented in the OpenNETCF Mail code. We just never got around to doing it. An email with attachments is simply multipart MIME message, which is not terribly complex and is <a href="http://www.w3.org/Protocols/rfc1341/7_2_Multipart.html" rel="nofollow">covered in RFC 1341</a>. You would have to extend the code to build up a multipart MIME message, and then set the appropriate content-type.</p>