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Why do the message score and the number of stars show something different?

Upgrade to 3.0 and they shouldn't anymore. This was a common question and was filed as a [http://bugzilla.spamassassin.org/show_bug.cgi?id=2607 bug] and fixed.

If the score of a spam is 4.995, and required hits are 5.0, the message's headers should show:

X-Spam-Level: ****
X-Spam-Status: No, hits=4.9 required=5.0

This rounding down of the spam hits (to the nearest 0.1) and of the stars (to the nearest integer) will hopefully be a more intuitive result.

Why do the points of individual rules in the content analysis not add up to the same point total?

The actual scores of the rules have three digits after the decimal, but in the Content analysis report they are rounded off to the nearest tenth.

The points shown for individual rules in the following example total 8.5, not the 8.6 indicated.

Content analysis details:   (8.6 points, 5.0 required)

 pts rule name              description
---- ---------------------- --------------------------------------------------
 1.7 MSGID_FROM_MTA_ID      Message-Id for external message added locally
 0.0 HTML_MESSAGE           BODY: HTML included in message
 5.0 BAYES_99               BODY: Bayesian spam probability is 99 to 100%
                            [score: 0.9985]
 0.2 MIME_HTML_ONLY         BODY: Message only has text/html MIME parts
 1.0 HTML_IMAGE_ONLY_16     BODY: HTML: images with 1200-1600 bytes of words
 0.6 FORGED_OUTLOOK_HTML    Outlook can't send HTML message only

The actual scores for each of these rules are shown below. They total 8.577, which clearly rounds to 8.6

1.723  MSGID_FROM_MTA_ID
0.001  HTML_MESSAGE
5.000  BAYES_99
0.177  MIME_HTML_ONLY
1.047  HTML_IMAGE_ONLY_16
0.629  FORGED_OUTLOOK_HTML    
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