한메일로 이메일을 보내면 반송되어서 돌아오는데요 이러한 메시지가
뜬 경우에는 sendmail 설정을 어떻게 고쳐야 하나요?
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 The original message was received at Mon, 21 Jan 2002 12:07:57 +0900
from rf06.hanyang.ac.kr [166.104.46.130]
    ----- The following addresses had transient non-fatal errors -----
<jinkim01 at daum.net>
    ----- Transcript of session follows -----
... while talking to mx2.hanmail.net.:
>>> MAIL From:<jinkim01 at ece.hanyang.ac.kr> SIZE=50
<<< 451 4.1.8 Sender domain must resolve(ece.hanyang.ac.kr)