메일서버에게 자기 이름을 정확히 가르쳐주세요.
현재 자기자신을 localhost.localdomain 으로 인식하고 있습니다.
/etc/hosts 에
 123.45.67.89 mail.rank300.com mail
 정도는 적어주셔야죠.
 그리고 /etc/mail/sendmail.cw (또는 local-host-names) 도 살펴보시고요.
DNS 문제일지도 모릅니다.
  : 메일은 잘보내지는데 메일 수신이 안됩니다.
: 여기 에러 내용 있습니다. 도와주세요.The original message was received at Fri, 22 Dec 2000 15:45:11 +090
: 0 from www9.hanmail.net [211.32.117.29]
:
: ----- The following addresses had permanent fatal errors -----
: <webmaster at rank300.com>
: (reason: 550 5.7.1 <webmaster at rank300.com>... Relaying denied. IP name lookup failed [211.62.252.66])
:
: ----- Transcript of session follows -----
: ... while talking to mail.rank300.com.:
: >>> RCPT To:<webmaster at rank300.com>
: <<< 550 5.7.1 <webmaster at rank300.com>... Relaying denied. IP name lookup failed [211.62.252.66]
: 550 5.1.1 <webmaster at rank300.com>... User unknown
:
:
: Reporting-MTA: dns; localhost.hanmail.net
: Arrival-Date: Fri, 22 Dec 2000 15:45:11 +0900
:
: Final-Recipient: RFC822; webmaster at rank300.com : Action: failed
: Status: 5.7.1
: Remote-MTA: DNS; mail.rank300.com
: Diagnostic-Code: SMTP; 550 5.7.1 <webmaster at rank300.com>... Relaying denied. IP name lookup failed [211.62.252.66]
: Last-Attempt-Date: Fri, 22 Dec 2000 15:50:12 +0900--qKing