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▷ 제품버젼 : 3.5
▷ 사용중인 주소(URL) : http://www.ac.kr
▷ 문제발생시 메뉴/주소 :
▷ 문제발생시 에러메세지
: Error Message : 441 4.4.1 temporay dns failed

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▷ 질문내용
: 내부에서 메일교환은 잘됩니다. 다음은 송수신불가,야후는 송신만 가능,네이버도 송신만가능
왜 그런지 ....