몇몇 도메인으로 메일이 나가지 않고 Return되서 돌아오는거 같아서

로그를 살펴보니 아래와 같이 에러로그가 남아있네요.

특정도메인만 그러는게 아니라...몇몇 도메인에서 발생을 하는거 같은데

원인이 무엇인지 찾기가 힘드네요.

[PeekTime] ***-****-**** : Fri, 11 Jun 2010 10:25:51 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 10:34:03 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 10:42:35 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 10:51:39 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 11:01:15 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 11:11:39 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 11:22:35 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 11:34:03 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 11:46:18 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 11:59:22 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 12:13:14 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 12:27:54 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 12:43:22 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 12:59:54 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 13:17:30 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 13:36:10 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 13:55:54 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 14:16:58 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 14:39:22 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 15:03:06 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 15:28:10 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 15:54:50 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 16:23:06 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 16:53:13 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 17:25:13 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 17:59:05 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 18:35:05 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 19:13:29 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 19:54:17 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 20:37:29 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 21:23:21 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>
[PeekTime] ***-****-**** : Fri, 11 Jun 2010 22:12:08 +0900
<<
ErrCode = -3
ErrString = Network kernel error
SMAIL SMTP-Send EDNS = "error-domain.com" SMTP = "send-domain.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "Network kernel error"
SMTP-Server = "error-domain.com"
>>