Spamassassin: spam scoring -100 as users in whitelist

Of course, they are not whitelisted...

[silverbytes]

I'm receiving spam scoring -100 points because are detected as users in whitelist, so as the result I get viagra and similar messages but of course those senders are not in my whitelist?
What is that?
Did they get to forge that too?

[bill]

If you train it on those messages with the Bayesian filtering you may have luck getting rid of those. Either that or you may need to re-consider your whitelist.

[silverbytes]

How do I "train using bayesian"?

[bill]

From the SpamAssassin documentation: train SpamAssassin's Bayesian classifier [spamassassin.sourceforge.net]