> Personally I have only modified the SA plugin to replace the 
> X-Spam-Status header while leaving the other pre-existing headers 
> intact, but in fact it should be possible to avoid even this by 
> modifying sub get_spam_score() to retrieve only the most
> recent X-Spam-Status header.

No.

1.) Header lines do not have an order. You can not say which is
    the more recent one.

2.) X-Spam-Status does not contain an identifier which allows
    to check for a specific hosts scoring.

3.) procmail and other mail filtering tools do not check for
    an order of header lines as well (because there is no
    order).

If you really want, one might think about replacing old
X-Spam-Status lines with something like X-Old-Spam-Status. 
In fact all implementations i've seen recently (including
the de-facto standards amavisd-new and qmail-scanner) do
remove old X-Spam-Status line.

-kju

-- 
      It's an insane world, but i'm proud to be a part of it. -- Bill Hicks

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