I get lots of spam with kopano

UCS - Univention Corporate Server
6

Update, I have run: ucr set mail/antispam/requiredhits=“5.0” and couple of config files got recreated.
I do get following now:

X-Virus-Scanned: by amavisd-new-2.10.1 (20141025) (Debian) at mydomain.com
X-Spam-Flag: NO
X-Spam-Score: 4.38
X-Spam-Level: ****
X-Spam-Status: No, score=4.38 tagged_above=-1000 required=5
	tests=[DKIM_INVALID=0.1, DKIM_SIGNED=0.1, FROM_SUSPICIOUS_NTLD=0.5,
	FROM_SUSPICIOUS_NTLD_FP=0.396, HTML_FONT_LOW_CONTRAST=0.001,
	HTML_MESSAGE=0.001, LOTS_OF_MONEY=0.001, PDS_OTHER_BAD_TLD=1.999,
	RDNS_NONE=1.274, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001,
	T_KAM_HTML_FONT_INVALID=0.01] autolearn=disabled

Though the spam seems to go through. Any pointers on improving it?