# File lib/action_mailer/vendor/tmail-1.1.0/tmail/net.rb, line 159
    def setup_forward( mail )
      m = Mail.new(StringPort.new(''))
      m.body = decoded
      m.set_content_type 'message', 'rfc822'
      m.encoding = encoding('7bit')
      mail.parts.push m
    end