Forwarding email header

On last Friday, I was in a pulic anti-spam workshop. Some people asked how to forward spam mail to an ISP complaint account since clicking the forwarding button will just send the mail contents without the mail header. A clever guy working in the ISP industry said that in common mail clients such as Outlook or Outlook Expresee, forwarding as attachment will combine everything. Woo.... this is very useful and I need to remembe this technique from time to time.