Nowadays rspamd is used instead of Spamassassin. Maybe that one has tools to do what you want.
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These projects are poorly maintained and abandoned because the industry of email has been reduced to a very few players, and they don't care about IMAP standards, dmarc, dkim or any of it.
You're running head on into the primary reason no one self-hosts email anymore; it has gone from being a nuisance to being adversarial.
Indeed.
The whole mess seems to have gotten so much worse.