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We're getting a high number of these as well, and I've enabled SMTPAUTH_RESTRICT and listed GB in CC_ALLOW_SMTPAUTH (I've also made the necessary changes to Exim as detailed in https://download.configserver.com/csf/readme.txt at " 25. Exim SMTP AUTH Restriction ". Exim now verifies the IP ...

I've just been looking myself and by following the source code I found it stored in: /var/lib/csf/Geo

Hope it helps!