Is BAYES filtering working? Having doubts.

[Peter L. Berghold]

I've been noticing a lot of SPAM emails coming to my account with 
subject headers "Trump's Brain Secret" and similar, along with "Amazon 
Gift Card" and other something for nothing sorts of emails.  I keep 
feeding them to sa-learn and yet they still keep popping up every other 
fetch from my server.

How do I figure out where the issue is or if the learning is even 
working?

Thanks in advance,

Peter L. Berghold