안녕하세요.
 sendmail로 메일서버를 돌리고 있는데 특정호스트쪽으로만 메일못내는것 같네요.
 메일로그를 보면..
 Dec 28 16:57:18 mail sendmail[74675]: fBS7vFq74673: to=<xxxxxxxx at lycos.co.kr>, ctladdr=nobody (65534/65534), delay=00:0
0:03, xdelay=00:00:03, mailer=esmtp, pri=41540, relay=kr-inmail.lycos.co.kr. [211.51.63.164], dsn=4.0.0, stat=Deferred:
Connection refused by kr-inmail.lycos.co.kr.  Dec 28 16:57:49 mail sendmail[74722]: fBS7vex74700: to=<xxxxxxxx at lycos.co.
kr>, ctladdr=nobody (65534/65534), delay=00:00:09, xdelay=00:00:03, mailer=esmtp, pri=41197, relay=kr-inmail.lycos.co.kr
. [211.51.63.164], dsn=4.0.0, stat=Deferred: Connection refused by kr-inmail.lycos.co.kr. [root@mail]#  이렇게 connec
tion refused 가 나는데..  제쪽 메일서버 세팅의 잘못인지 아니면,  라이코스쪽에서 저희쪽 호
스트를 막아 놓은건지.. 알수 없군요.  Dec 28 15:53:38 mail sendmail[65947]: fBS6rSP65938: to=<xxxxxx@lycos.
co.kr>, ctladdr=nobody (65534/65534), delay=00:00:10, xdelay=00:00:08, mailer=esmtp, pri=41538, relay=kr-inmail.lycos.co
.kr. [211.51.63.164], dsn=2.0.0, stat=Sent (PAA25443 Message accepted for delivery)  Dec 28 15:54:38 mail sendmail[66123
]: fBS6saF66120: to=<xxxxxxxxx at lycos.co.kr>, ctladdr=nobody (65534/65534), delay=00:00:02, xdelay=00:00:01, mailer=esmtp
, pri=41539, relay=kr-inmail.lycos.co.kr. [211.51.63.164], dsn=2.0.0, stat=Sent (PAA22382 Message accepted for delivery)
  Dec 28 16:20:50 mail sendmail[69482]: fBS7KkU69473: to=<xxxxxx at lycos.co.kr>, ctladdr=nobody (65534/65534), delay=00:00
:04, xdelay=00:00:02, mailer=esmtp, pri=41533, relay=kr-inmail.lycos.co.kr. [211.51.63.164], dsn=2.0.0, stat=Sent (QAA27
367 Message accepted for delivery)  Dec 28 16:21:00 mail sendmail[69500]: fBS7Kvo69498: to=<xxxxxxxxxx at lycos.com>, ctlad
dr=nobody (65534/65534), delay=00:00:03, xdelay=00:00:03, mailer=esmtp, pri=41566, relay=mx2.mail.lycos.com. [209.185.12
3.148], dsn=2.0.0, stat=Sent ([SMTPD]: OK)  Dec 28 16:23:31 mail sendmail[69884]: fBS7NRg69882: to=<xxxxxxxx at lycos.co.kr
>, ctladdr=nobody (65534/65534), delay=00:00:04, xdelay=00:00:03, mailer=esmtp, pri=41178, relay=kr-inmail.lycos.co.kr. 
[211.51.63.164], dsn=4.0.0, stat=Deferred: Connection refused by kr-inmail.lycos.co.kr.  Dec 28 16:24:00 mail sendmail[6
9966]: fBS7O0q69964: to=<xxxxxxx at lycos.co.kr>, ctladdr=nobody (65534/65534), delay=00:00:00, xdelay=00:00:00, mailer=esm
tp, pri=41540, relay=kr-inmail.lycos.co.kr. [211.51.63.164], dsn=4.0.0, stat=Deferred: Connection refused by kr-inmail.l
ycos.co.kr.  가끔씩 메일이 가는것도 있어서.. 막아놓은것 같지는 않는데..  혹시나.. 해결방
법을 아시는분이 계시면 답변좀 부탁드립니다.  감사합니다.   덧붙임.  로그를 보고 있으
니까 잘가는건 dsn=2.0.0 이라고 나오고 dsn=4.0.0 이라고 나온건  connection refused 가 나오는거 같
은데 dsn 이 무엇인가요?,  그냥 단순하게 메일로그의 상태만을 나타내주는것인지.. 아님 다
른이유가 있는것인지 -_-;;  -- May the force be with you.