메일은 잘보내지는데 메일 수신이 안됩니다.
여기 에러 내용 있습니다. 도와주세요.The original message was received at Fri, 22 Dec 2000 15:45:11 +0900
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