안녕하셔염...
 Linux 알짜 6.1에 있는 센드 메일인데여...
 메일을 보냈는데 아래와 같은 메일이 메일 서버의 root로 돌아 왔어염...
 The original message was received at Sat, 23 Sep 2000 12:34:50 +0900
from nobody@localhost     ----- The following addresses had permanent fatal errors -----
l5hj at unitel.co.kr     ----- Transcript of session follows -----
... while talking to imail22.unitel.co.kr.:
>>> MAIL From:<nobody at localhost.localdomain> SIZE=2932
<<< 501 <nobody at localhost.localdomain>... Sender domain must exist
501 l5hj at unitel.co.kr... Data format error
 도와 주셔염... ㅡ.ㅡ