답변 주셔서 정말 감사합니다.
 : /etc/hosts.allow 에 설정 되어 있고요
: telnet localhost 110
: telnet localhost 25
: 테스트도 성공했고요
 그런데.. sendmail 과 /etc/hosts.deny는 무관하지 않나요?
 그런데 /etc/hosts.deny 를 ALL:ALL로하기만 하면
아래와 같은 에러가 나네요.
 ALL:ALL을지우면 물론 깨끗하게 메일수신이 되고요..윽..
 원래 ALL:ALL로 해놓는게 맞지 않나요??
  한메일 -> 회사메일로 보네면
 제목 : Mail Deliver... Returned mail: see transcript for details
 내용 : The original message was received at Thu, 5
Sep 2002 00:06:42 +0900
from www16.hanmail.net [211.32.117.36]
 ----- The following addresses had permanent fatal errors -----
<k2 at world.co.kr>
(reason: 550 5.0.0 Access denied)
 ----- Transcript of session follows -----
... while talking to mail.world.co.kr.:
>>> MAIL From:<sun at hanmail.net>
<<< 550 5.0.0 Access denied
554 5.0.0 Service unavailable
  Reporting-MTA: dns; smail-108.hanmail.net
Arrival-Date: Thu, 5 Sep 2002 00:06:42 +0900
 Final-Recipient: RFC822; k2 at world.co.kr Action: failed
Status: 5.0.0
Diagnostic-Code: SMTP; 550 5.0.0 Access denied
Last-Attempt-Date: Thu, 5 Sep 2002 00:06:45 +0900