현재 하나의 도메인은 메일설정을하여 사용하고 있습니다.
그런데 추가로 도메인을 등록하여사용을 하려고 하는데
등록된 도메인에게도 메일을 부여하여 사용하려고 합니다.
근데 메일이 보내기는 되는데 받는부분이 안되네요..
 아래의 내용은 그 리턴메일입니다. 무엇이 잘못된는지 도와주세요..
 ----- The following addresses had permanent fatal errors -----
<x-ray at sehwamedical.co.kr>
(reason: 550 <x-ray at sehwamedical.co.kr>... Relaying denied)
 ----- Transcript of session follows -----
... while talking to mail.sehwamedical.co.kr.:
>>> RCPT To:<x-ray at sehwamedical.co.kr>
<<< 550 <x-ray at sehwamedical.co.kr>... Relaying denied
550 5.1.1 <x-ray at sehwamedical.co.kr>... User unknown
  Reporting-MTA: dns; s-mail2.hanmail.net
Received-From-MTA: DNS; www4.hanmail.net
Arrival-Date: Wed, 22 Nov 2000 18:55:16 +0900
 Final-Recipient: RFC822; x-ray at sehwamedical.co.kr Action: failed
Status: 5.1.1
Remote-MTA: DNS; mail.sehwamedical.co.kr
Diagnostic-Code: SMTP; 550 <x-ray at sehwamedical.co.kr>... Relaying denied
Last-Attempt-Date: Wed, 22 Nov 2000 19:00:30 +0900