[kmail2] [Bug 451369] Header of a message shows "Spamassassin" for "Spam Status", despite using another spam filter

[CaCO3]

https://bugs.kde.org/show_bug.cgi?id=451369

--- Comment #2 from CaCO3 <caco3 at ruinelli.ch> ---
I created my own (2nd stage) spam filter. It basically is a Bayesian Filter run
on server side. It prepends the following fields onto my mails:
X-Spam-Checker-Version: CaCO3s Personal Mail Filter (2022-03-08)
X-Spam-Flag: NO
X-Spam-Status: NO, score=25 required=600 
X-Spam-Report:
        * WORD_CLASSIFIER

I adapted those headers by try and error and found that kmail needs
X-Spam-Status and X-Spam-Report for correctly showing the score correctly in
the score bar.

I am aware that additionally there are the same fields used for spamassassin
(1th stage spam filter) further down in the header, but kmail seems to use the
fields first found in the mail.

Below an example mail content:
X-Spam-Checker-Version: CaCO3s Personal Mail Filter (2022-03-08)
X-Spam-Flag: NO
X-Spam-Status: NO, score=25 required=600 
X-Spam-Report:
        * WORD_CLASSIFIER
[..]
X-Spam-Checker-Version: SpamAssassin 3.4.5 (2021-03-20)
X-Spam-Level: 
X-Spam-Status: No, score=-9.2 required=4.0 tests=BAYES_00,DKIMWL_WL_HIGH,
        [..]

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