There is a Wiki page on rounding issues within SpamAssassin:

http://wiki.apache.org/spamassassin/RoundingIssues

- Three decimal rules, one decimal composite, not to mention
  dynamic scoring by third party plugins.  E-gads.

This bug may be pertinent in your case also:

https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6419

Regards,

Jared Hall
General Telecom, LLC.


Gnanam wrote:
> Hi,
> I'm using SpamAssassin version 3.3.1 running Perl version 5.8.5 on RHEL5.
>
> I've a mail message (not relayed via SMTP) for which I was trying to test
> the spam score based on body content and email header.
>
> Command used to check spam score: spamc -R < /tmp/mymailmessage.txt
>
> My question is, though SA reports 2.8 points at the top, on summing-up each
> points from the Content analysis details, it is only 2.7 points.  Why SA is
> reporting/showing an increase by 0.1 point from its Content analysis details
> points sum?
>
> Here is the 
> Content analysis details:   (2.8 points, 5.0 required)
>
>  pts rule name              description
> ---- ----------------------
> --------------------------------------------------
> -0.0 NO_RELAYS              Informational: message was not relayed via SMTP
>  0.0 NORMAL_HTTP_TO_IP      URI: Uses a dotted-decimal IP address in URL
>  0.7 HTML_IMAGE_ONLY_20     BODY: HTML: images with 1600-2000 bytes of words
>  0.0 HTML_MESSAGE           BODY: HTML included in message
>  1.1 MIME_HTML_ONLY         BODY: Message only has text/html MIME parts
>  0.6 HTML_MIME_NO_HTML_TAG  HTML-only message, but there is no HTML tag
>  0.3 HTML_SHORT_LINK_IMG_3  HTML is very short with a linked image
> -0.0 NO_RECEIVED            Informational: message has no Received headers
>
> Regards,
> Gnanam
>   

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