No spam???

[John Almberg]

Last week I set up a brand new mail server with a combination of pf/ 
spamassassin/maildrop for spam filtering... Everything seems to work  
great. All real mail seems to be getting through. I monitored the  
spamd and maildrop logs during the first few days to make sure my  
very conservative spam settings (spamd marks email that scored higher  
than 5 as spam, and maildrop drops spam that scores higher than 12)  
to make sure that real mail isn't getting dropped.

At the beginning of the week, I was getting a few spam a day in my  
spam folder. What has me spooked is that this whole weekend I got  
exactly one spam in my spam folder (a false positive, in fact). This  
is down from around 500 that I normally get per day (which is why I  
was keen to get an up-to-date mailserver!)

I know this is an odd thing to worry about, but is this normal? Since  
the spam doesn't even seem to be reaching spamd, I'm guessing that  
the real hero is pf, which must be blocking 99.99% of spam at the  
packet level.

Is this normal?

TIA: John