해결좀 해주세요...^^;

제가 메일을 보냈는데 이런 에러메세지가 오더라구요..

한메일에서 제가 세팅한 메일 서버로 보냈는데 왜 이럴까요??

하루 빨리 해결해야 되는데 고수님들 좀 가르쳐 주세요...

The original message was received at Sat, 17 Aug 2002 03:16:51 +0900
from www31.hanmail.net [211.32.117.211]

----- The following addresses had permanent fatal errors -----
<aaaa@xxxxx.net>
(reason: 550 5.7.1 <aaaa@xxxxx.net>... Relaying denied)

----- Transcript of session follows -----
... while talking to xxxxx.net.:
>>> RCPT To:<aaaa@xxxxx.net>
<<< 550 5.7.1 <aaaa@xxxxx.net>... Relaying denied
550 5.1.1 <aaaa@xxxxx.net>... User unknown

Reporting-MTA: dns; smail-103.hanmail.net
Arrival-Date: Sat, 17 Aug 2002 03:16:51 +0900

Final-Recipient: RFC822; aaaa@xxxxx.net
Action: failed
Status: 5.7.1
Remote-MTA: DNS; xxxxx.net
Diagnostic-Code: SMTP; 550 5.7.1 <aaaa@xxxxx.net>... Relaying denied
Last-Attempt-Date: Sat, 17 Aug 2002 03:17:04 +0900