Nice never heard of those until now. Link for anyone here cause it's kinda hard to google razor email filter for some reason. What does that setup have over amavisd?

https://notes.sagredo.eu/en/qmail-notes-185/razor2-pyzor-spa...

I investigated further and these don't really seem to be incredibly active projects, you sure this is the best solution?

https://github.com/toddr/Razor2-Client-Agent

https://github.com/SpamExperts/pyzor/tree/release-1-0-0