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What you see when your domain has this problem
Added to KISA Details area Ignore

More Information About Kisa

A listing by KISA RBL indicates that the affected IP address has been seen sending spam to Korea Internet & Security Agency (KISA) mail servers. The KISA RBL uses a variety of spam information to determine IPs to blacklist for sending spam.

More information about KISA can be found at their website: https://www.kisarbl.or.kr/english/