Spamassassin not well configured

[Kocisky]

Hi,

i've been strugling with spam messages, i have 2 servers, the first one
runs MailScanner/Postfix/Spamassassin/Clamav/Postgrey and the second once
Zimbra. I dont understand why the same spam message on the first servers
gets:

MailScanner-SpamCheck: not spam, SpamAssassin (not cached,
score=2.38, required 3, HTML_MESSAGE 0.00, MIME_HTML_ONLY 1.10,
RDNS_NONE 1.27)

while on Zimbra:

score=6.29 tagged_above=-10 required=6.6
	tests=[BAYES_50=0.8, DEAR_EMAIL=0.001, HTML_MESSAGE=0.001,
	MIME_HTML_ONLY=0.723, RDNS_NONE=0.793, SUBJ_YOUR_DEBT=0.987,
	T_URIBL_BLACK_OVERLAP=0.01, URIBL_BLACK=1.725, URIBL_JP_SURBL=1.25]
	autolearn=no


what am i missing? it seems MailScanner/Spamassassin by default is not
well configured, how do i check which rules are considered for each
message?


thanks!
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