적수네 동네 - 질문과 답변 [ 게시물 수정 ]

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아래와 같은 반송메일이 한메일로부터 며칠전부터 들어오기 시작합니다.
물론 약 3달정도 아무 문제없이 사용했었습니다.
다른곳 드림위즈, 코리아닷컴 등은 아무 문제없이 잘 가구요..
 아래 메일은 아웃룩으로 보낸것과 해당 서버에서 자동으로 php스크립트로 
답장메일이 가는것에 대해서 반송됩니다.
 한메일쪽 DNS에 mail.abc.com이 등록되지 않았을까 싶어서 nslookup 해봤지만 
잘 나옵니다.
 현재 서비스중인 메일서버라 걱정이 태산입니다.
답을 찾기기 힘드네요..
 고수님들 꼭 도와주시길 부탁드립니다.
      **********************************************
    **      THIS IS A WARNING MESSAGE ONLY      **
    **  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **
    **********************************************
 The original message was received at Thu, 27 Dec 2001 09:34:19 +0900 (KST)
from [211.xx.xx.xxx]
    ----- The following addresses had transient non-fatal errors -----
<rise999@hanmail.net>
    ----- Transcript of session follows -----
... while talking to mx2.hanmail.net.:
>>> MAIL From:<rise@abc.com> SIZE=4103
<<< 451 4.1.8 Sender domain must resolve(abc.com)
... while talking to mx1.hanmail.net.:
>>> MAIL From:<rise@abc.com> SIZE=4103
<<< 451 4.1.8 Sender domain must resolve(abc.com)
... while talking to mx8.hanmail.net.:
>>> MAIL From:<rise@abc.com> SIZE=4103
<<< 451 4.1.8 Sender domain must resolve(abc.com)
... while talking to mx7.hanmail.net.:
>>> MAIL From:<rise@abc.com> SIZE=4103
<<< 451 4.1.8 Sender domain must resolve(abc.com)
... while talking to mx9.hanmail.net.:
>>> MAIL From:<rise@abc.com> SIZE=4103
<<< 451 4.1.8 Sender domain must resolve(abc.com)
... while talking to mx6.hanmail.net.:
>>> MAIL From:<rise@abc.com> SIZE=4103
<<< 451 4.1.8 Sender domain must resolve(abc.com)
... while talking to mx3.hanmail.net.:
>>> MAIL From:<rise@abc.com> SIZE=4103
<<< 451 4.1.8 Sender domain must resolve(abc.com)
... while talking to mx4.hanmail.net.:
>>> MAIL From:<rise@abc.com> SIZE=4103
<<< 451 4.1.8 Sender domain must resolve(abc.com)
... while talking to mx10.hanmail.net.:
>>> MAIL From:<rise@abc.com> SIZE=4103
<<< 451 4.1.8 Sender domain must resolve(abc.com)
... while talking to mx5.hanmail.net.:
>>> MAIL From:<rise@abc.com> SIZE=4103
<<< 451 4.1.8 Sender domain must resolve(abc.com)
<rise999@hanmail.net>... Deferred: 451 4.1.8 Sender domain must resolve(abc.com)
Warning: message still undelivered after 4 hours
Will keep trying until message is 5 days old