The original message was received at Tue, 4 Mar 2003 17:14:00 +0900
from [211.32.117.25]

----- The following addresses had permanent fatal errors -----
<****@****>
(reason: 550 5.7.1 Unable to relay for ****@****)

----- Transcript of session follows -----
... while talking to bestbooker.com.:
>>> DATA
<<< 550 5.7.1 Unable to relay for ****@****
550 5.1.1 <****@****>... User unknown
<<< 554 5.5.2 No valid recipients

Reporting-MTA: dns; smail-7.hanmail.net
Arrival-Date: Tue, 4 Mar 2003 17:14:00 +0900

Final-Recipient: RFC822; ****@****
Action: failed
Status: 5.7.1
Remote-MTA: DNS; bestbooker.com
Diagnostic-Code: SMTP; 550 5.7.1 Unable to relay for ****@****
Last-Attempt-Date: Tue, 4 Mar 2003 17:14:15 +0900


이것은 무엇을 말하는 것인가요.. 아웃룩에서 아웃룩으로 보내면 되는데.. 웹에서 즉, 한메일, 핫메일,코리아닷컴에서는 보내면 리턴되는메시지 입니다.
답변좀 부탁드립니다.