How do I know if SPF is working on my SA 3.0?

[Joe Emenaker]

Okay... I downloaded/compiled/installed SA 3.0-pre4... solely for having 
SPF.

I've installed Mail::SPF::Query.
How do I tell if it's working? I don't see any SPF-related scoring in 
any of the headers... in spam, nor ham.

- Joe