Korea메일쪽에만 이메일 발송시 다음과 같은 에러가 발생합니다..
다른 이메일 주소로 발송시에는 괜찮은데.. Korea메일에만 송신하면 문제가 생기네요..
Korea메일측에서 뭔가 막아놓은건가요..?

확인좀 부탁드립니다..
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