Set the html part of the email. This is optional
[Visual Basic] Public Property HtmlPart As HtmlAttachment [C#] public HtmlAttachment HtmlPart { get; set; } [C++] public: __property HtmlAttachment* get_HtmlPart(); public: __property void set_HtmlPart(HtmlAttachment* ); [JScript] public function get HtmlPart() : HtmlAttachment public function set HtmlPart(HtmlAttachment);