After about 3 and a half years I've finally gotten around to looking into why my spamassassin service tags every email the with RDNS_NONE rule.
All it took was to copy some binaries and dependencies (particularly for /etc/resolve.conf to work) into my postfix chroot jail and now it work's perfectly!
One of those niggly little problems that didn't really bother anyone but I'm happy it's done now! 😅
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