사용하는건 와우리눅스고요
 www.ex.com이라는 도메인을 사용하고 있다고 가정하면
 메일 보낼때 ex at ex.com 이렇게 보내면 짤없이
 --------------------------
The original message was received at Wed, 24 Jul 2002 01:02:47 +0900
from www29.hanmail.net [211.32.117.209]
 ----- The following addresses had permanent fatal errors -----
<ex at ex.com>
(reason: 550 5.7.1 <ex at ex.com>... Relaying denied)
 ----- Transcript of session follows -----
... while talking to ex.com.:
>>> RCPT To:<ex at ex.com>
<<< 550 5.7.1 <ex at ex.com>... Relaying denied
550 5.1.1 <ex at ex.com>... User unknown
  Reporting-MTA: dns; smail-103.hanmail.net
Arrival-Date: Wed, 24 Jul 2002 01:02:47 +0900
 Final-Recipient: RFC822; ex at ex.com Action: failed
Status: 5.7.1
Remote-MTA: DNS; ex.com
Diagnostic-Code: SMTP; 550 5.7.1 <ex at ex.com>... Relaying denied
Last-Attempt-Date: Wed, 24 Jul 2002 01:02:55 +0900
 이렇게 에러 메일이 돌아 옵니다
 물론 ex at www.ex.com 이렇게 보내면 잘 가지고욤 왜 그렇죠???--초보들 ㅡㅡ; 일진~