드림위즈에서 보냈는데 이런 메세지가 반송됐구요.
telnet mong.chosun.ac.kr smtp
telnet mong.chosun.ac.kr pop3
는 정상적인거 같던데... 알수 없군요..
사용자는 sehyun과 ddolddol이 있습니다.
좀 가르쳐 주십시요.

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The original message was received at Wed, 16 Apr 2003 19:12:52 +0900 (KST)
from mail2.dreamwiz.com [211.39.128.22]

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

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



크기 : 753 문자셋 : US-ASCII 인코딩 : 7BIT 내려받기


Reporting-MTA: dns; mx-s0.dreamwiz.com
Received-From-MTA: DNS; mail2.dreamwiz.com
Arrival-Date: Wed, 16 Apr 2003 19:12:52 +0900 (KST)

Final-Recipient: RFC822; ****@****
Action: failed
Status: 5.7.1
Remote-MTA: DNS; mong.chosun.ac.kr
Diagnostic-Code: SMTP; 550 5.7.1 Unable to relay for ****@****
Last-Attempt-Date: Wed, 16 Apr 2003 19:12:53 +0900 (KST)

Final-Recipient: RFC822; ****@****
Action: failed
Status: 5.7.1
Remote-MTA: DNS; mong.chosun.ac.kr
Diagnostic-Code: SMTP; 550 5.7.1 Unable to relay for ****@****
Last-Attempt-Date: Wed, 16 Apr 2003 19:12:53 +0900 (KST)

Return-Path: <****@****>
Received: from mail2.dreamwiz.com (mail2.dreamwiz.com [211.39.128.22])
by mx-s0.dreamwiz.com (8.12.9/8.12.9) with ESMTP id h3GACql5022112;
Wed, 16 Apr 2003 19:12:52 +0900 (KST)
Received: from localhost (localhost [127.0.0.1])
by mail2.dreamwiz.com (8.12.9/8.12.9) with ESMTP id h3GACkEm009771;
Wed, 16 Apr 2003 19:12:46 +0900 (KST)
Message-Id: <****@****>
Date: Wed, 16 Apr 2003 19:12:46 +0900 (KST)
From: SeHyun Park <****@****>
Subject: dddd
To: ****@****
cc: ****@****
Organization:
X-Sender-IP: 203.237.109.32
X-Sender-ID: ****@****
X-Priority: 3
X-Mailer: DreamWiz Web-Mailer V1.70
X-DreamWiz-Data: receive_check=1;save=mail2.dreamwiz.com:photo0:Sent:23;
MIME-Version: 1.0
Content-Type: MULTIPART/ALTERNATIVE; BOUNDARY="0-***-****-****-***-****-****=:9769"