are you sure you want to do this? It will definitely result in lots of legitimate mail being blocked, because SPF is by no means ubiquitous.
You can set up your mail server to block mail if the SPF record suggests it, but I would never filter mail originating from domains having no SPF record at all.
Best regards,
Peter.
Dear Peter,
Thanks for your response. it is true what you are saying. but we want to set that way.
Prabh S. Mavi