Client country code/location
The client_cc field is in FortiMail log messages where type=statistics.
The field indicates the geographical location associated with the SMTP client's IP address (client_ip) according to the FortiGuard GeoIP database. Public network IP addresses have an associated country code, such as client_cc="DE" for Germany. Private network IP addresses (RFC 1918) are not globally unique and therefore cannot be definitively associated with any known location, and so they use the reserved country code (client_cc="ZZ").