회사에서 웹서버와 메일서버를 자체 운영하려고 합니다
그 전에는 웹호스팅을 했었는데...
 메일서버는 그전에 아래와 같이 사용했습니다
  @aaa.co.kr  로 들어오는 메일을 @bbb.co.kr 로 포워딩 되게
사용하고 있습니다
 제가 서버 설치는 레드헷 8.0 sendmail 을 설치하고 사용합니다
 포워딩을 하지 않은상태에서는 주고 받는 메일이 잘됩니다
그런데 포워딩만 하면
 문서:	메일테스트
배달되지 않은 수신인:	sorisuwha at mail.oilless.co.kr 이유:	554 Relay rejected for policy reasons.
  이런 메시지만 뜹니다
 이것을 어떻게 해결해야 할까요
벌써 몇일째 책보고 해도 안되더라구요
고수님들 꼭 좀 부탁드립니다
 메일서버에서 maillog 를 보면 일단 메일이 오는거 같은데, 보내지를 못하는거
같습니다
 아래 내용은 maillog 내용입니다
봐주세요 ㅠ.ㅠ 꼭 좀 답변좀 부탁드립니다
 Dec 29 08:08:15 oilless sendmail[20410]: gBSN8Eg6020410: Losing ./qfgBSN8Eg6020410: savemail panic
Dec 29 08:08:15 oilless sendmail[20410]: gBSN8Eg6020410: SYSERR(root): savemail: cannot save rejected email anywhere
Dec 29 08:11:27 oilless popper[20424]: (v4.0.4) Unable to get canonical name of client 211.171.124.139: Unknown host (1)
Dec 29 08:11:27 oilless popper[20424]: Stats: sorisuhwa 0 0 0 0 211.171.124.139 211.171.124.139
Dec 29 08:28:16 oilless sendmail[20498]: gBSNSGg5020498: from=<sorisuhwa at luboinc.co.kr>, size=1112, class=0, nrcpts=1, m
sgid=<OF8A01A660.C52DB101-ON49256C9D.0000DF67 at onnet21.com>, proto=ESMTP, daemon=MTA, relay=dacommh01.onnet21.com [211.11
9.133.198] Dec 29 08:28:21 oilless sendmail[20500]: gBSNSGg5020498: to=<sorisuwha at mail.oilless.co.kr>, delay=00:00:05, x
delay=00:00:05,mailer=esmtp, pri=30842, relay=mail.onnet21.com. [211.119.133.198], dsn=5.0.0, stat=Service unavailable D
ec 29 08:28:21 oilless sendmail[20500]: gBSNSGg5020498: gBSNSLg5020500: DSN: Service unavailable Dec 29 08:28:21 oilless
 sendmail[20500]: gBSNSLg5020500: to=<sorisuhwa at luboinc.co.kr>, delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=32136
, relay=mail.onnet21.com. [211.119.133.198], dsn=2.0.0, stat=Sent (Message accepted for delivery) Dec 29 08:28:21 oilles
s sendmail[20500]: gBSNSGg5020498: to=Postmaster, delay=00:00:05, mailer=local, pri=30842, dsn=5.1.1, stat=User unknown 
Dec 29 08:28:21 oilless sendmail[20500]: gBSNSGg5020498: gBSNSLg6020500: postmaster notify: User unknown Dec 29 08:28:21
 oilless sendmail[20500]: gBSNSLg6020500: to=MAILER-DAEMON, delay=00:00:00, mailer=local, pri=0, dsn=5.1.1, stat=User un
known Dec 29 08:28:21 oilless sendmail[20500]: gBSNSLg6020500: to=postmaster, delay=00:00:00, mailer=local, pri=0, dsn=5
.1.1, stat=User unknown Dec 29 08:28:21 oilless sendmail[20500]: gBSNSLg6020500: gBSNSLg7020500: return to sender: User 
unknown Dec 29 08:28:21 oilless sendmail[20500]: gBSNSLg7020500: to=MAILER-DAEMON, delay=00:00:00, mailer=local, pri=0, 
dsn=5.1.1, stat=User unknown Dec 29 08:28:21 oilless sendmail[20500]: gBSNSLg6020500: Losing ./qfgBSNSLg6020500: savemai
l panic Dec 29 08:28:21 oilless sendmail[20500]: gBSNSLg6020500: SYSERR(root): savemail: cannot save rejected email anyw
here