----- The following addresses had transient non-fatal errors -----
xxx at aaa.com  ----- Transcript of session follows -----
... while talking to bbb.co.kr.:  <-- DNS서버네임
>>> RCPT To:<xxx at aaa.com>
<<< 450 4.7.1 <xxx at aaa.com>... Relaying temporarily denied. Cannot resolve PTR record for 210.116.116.12
xxx at aaa.com... Deferred: 450 4.7.1 <xxx at aaa.com>... Relaying temporarily denied. Cannot resolve PTR record for 210.116.1
16.12 Warning: message still undelivered after 4 hours
Will keep trying until message is 5 days old
 메일을 보내면 위와 같은 메세지가 나오면서 메일이반송됩니다.
 센드메일하구 bind,imap전부 재설치 했는데도 안됩니다.
 서버상에는 문제가없는것 같은데요...
 왜 그런지 아시는분들 답변부탁드립니다..