Message quarantined as SPAM

[Scappatura Rocco]

Hi,

I have Debian Lenny with postfix+amavisd-new+spamassassin+clamav.

I have detected that a message has been quarantined:

Jun 22 11:45:48 av8 amavis[22610]: (22610-11) Blocked SPAM {DiscardedOpenRelay,Quarantined}, [xxx.yyy.zzz.uuu]:50412 [xxx.yyy.zzz.uuu] <aaa at example.com> -> <bbb at mydomain>, quarantine: z/spam-zRJd9Wo5250M.gz, Queue-ID: 8647AD5DBA, Message-ID: <776AB7C587CC457C95FF35582FC9F0E1 at AutoRPZ.local>, mail_id: zRJd9Wo5250M, Hits: 6.793, size: 77514, 364 ms

But I have checked it against spamassassin:

gunzip -c z/spam-zRJd9Wo5250M.gz | spamassassin -t

and I get:

.
.
.

Content analysis details:   (4.1 points, 5.0 required)

 pts rule name              description
---- ---------------------- --------------------------------------------------
 0.0 HTML_MESSAGE           BODY: HTML included in message
 0.4 MIME_HTML_MOSTLY       BODY: Multipart message mostly text/html MIME
-1.9 BAYES_00               BODY: Bayes spam probability is 0 to 1%
                            [score: 0.0000]
 0.8 MPART_ALT_DIFF         BODY: HTML and text parts are different
 1.7 HTML_IMAGE_ONLY_08     BODY: HTML: images with 400-800 bytes of words
 0.0 TVD_SPACE_RATIO        No description available.
 1.4 SHORT_HELO_AND_INLINE_IMAGE Short HELO string, with inline image
 1.8 IMG_DIRECT_TO_MX       No description available.

So the total score is 4,2.

In amavisd configuraton file I have set:

$sa_spam_subject_tag = '[Spam] ';
$sa_tag_level_deflt  = 2.0;  # add spam info headers if at, or above that level
$sa_tag2_level_deflt = 6.31; # add 'spam detected' headers at that level
$sa_kill_level_deflt = 6.31; # triggers spam evasive actions
$sa_dsn_cutoff_level = 10;   # spam level beyond which a DSN is not sent

How the the score 6.793 of amavis is obtained?

Regards,

RS