what does this scoring on one of my received mails mean:
X-Virus-Scanned: amavisd-new at zimbra.myserver.com
X-Spam-Flag: YES
X-Spam-Score: 8.1
X-Spam-Level: ********
X-Spam-Status: Yes, score=8.1 tagged_above=-10 required=6.6
	tests=[BAYES_00=-1.9, SPF_FAIL=10] autolearn=no
As I understand, POSITIVE score means spam, and NEGATIVE means not-spam.
If this is correct, in this mail the most weight adds SPF_FAIL, which makes me thinking SPF of sender is failed. But it is not - SPF is correctly setup, and sender sent mail from permitted server per SPF.

Might it be Amavis does not handle SPF-Check properly?