in a fresh installation of ROS I installed spamassassin and enabled antispam in kmail.
The error message in the KMail Spam Filter Wizard is:
No anti-spam programs have been installed
You can find suitable plugins using this guide: The Anti-Spam Wizard
I have known your recommendation for many years and have taken these steps. The problem is apparently deeper. A test with bogofilter was negative. There is also the problem with Thunderbird that Spamassassin does not work. 
I have just installed ROS on another computer and set up Kmail with Antispam Assistant. Everything works there.
There were dual installations of Kmail, Kontakt and kde-pim-meta.
The anti-spam assistant is now working again
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