The ASN and RelayCountry plugins are supposed to add extra tokens to Bayes. However, I don't see any evidence that this is happening (in 3.3.0). In a test message I see:
bayes: header tokens for X-Relay-Countries = " GB GB ** ** GB GB" but don't see any corresponding tokens containing GB I also see the asn debug: asn: asn.routeviews.org.: lookup result packet: '228.99.151.89.asn.routeviews.org. 6580 IN TXT "24931" "89.151.64.0" "18"' and in the headers X-Spam-ASN: AS24931 89.151.64.0/18 but 24931 appears nowhere in the bayes tokens.