SPF question

I am looking at SPF and also read a few threads here.

I have set the default value of "Pass" for SPF through control panel.

But I don't understand how it makes a difference to spoofing attempts whether I don't use SPF at all in control panel vs. I put it as a "pass" value.

Can someone explain? I want to stop spoofing attempts as much as possible.

Thanks,
Sanjay
 
in fact, not only doubts here about the "pass" values... but all values.

If anyone cares to explain, or post a link, about how the whole thing works... would be great.


thanks in advance
 
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