Today i will show you how to block a country with their RELAY server.
let Say we wanna block Russia from spoofing our EFA
go to
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cd /etc/mail/spamassassin
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nano init.pre
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#
now edit local.cf
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nano local.cf
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header RELAYCOUNTRY_BADRUSSIANS X-Relay-Countries =~ /RU/
describe RELAYCOUNTRY_BADRUSSIANS Relayed through Russia
score RELAYCOUNTRY_BADRUSSIANS 10.0