Country metadata will also be added to the Bayesian filtering process, allowing it to learn information based on countries. You can also write rules that match specific countries and add them to your /etc/mail/spamassassin/local.cf file. For example: header RELAYCOUNTRY_BAD X-Relay-Countries =~ /CN/ describe RELAYCOUNTRY_BAD Relayed through China at some point score RELAYCOUNTRY_BAD 3.0 header REL