일단 리턴메일에 안내된 아래 주소로 접속해보았습니다.

http://mail.google.com/support/bin/answer.py?answer=10336

'사용 중인 IP는 권한이 없습니다...'

위 내용만으로는 어떤 근거로 IP를 차단하였는지 파악이 어렵습니다.

일단 한가지 예상되는 해결책은 아래처럼 Rerverse DNS 를 등록하신 후 다시 gmail 로 메일을 발송해보셔야 할 것 같습니다.

http://passkorea.net/Board/ViewDoc.aspx?brdNo=8&docNo=29293&page=1&brdType=

-------------------- Original message --------------------

※ 필수입력정보 ※

▷ 제품버젼 : 2.3.1

▷ 오류발생 메뉴/주소 :

▷ 에러메세지 :

[<00>] XMail bounce: Rcpt=[****@****];Error=[550-5.7.1 [124.51.110.141] The IP you're using to send mail is not authorized to
550-5.7.1 send email directly to our servers. Please use the SMTP relay at your
550-5.7.1 service provider instead. Learn more at http://mail.google
550 5.7.1 .com/support/bin/answer.py?answer=10336 t1si32280poh.21]


[<01>] Error sending message [1238596576470.1716.6.eml] from [beingmania.com].

ID:
Mail From: <****@****>
Rcpt To: <****@****>
Server: [209.85.199.114]


[<02>] The reason of the delivery failure was:

550-5.7.1 [124.51.110.141] The IP you're using to send mail is not authorized to
550-5.7.1 send email directly to our servers. Please use the SMTP relay at your
550-5.7.1 service provider instead. Learn more at http://mail.google
550 5.7.1 .com/support/bin/answer.py?answer=10336 t1si32280poh.21


[<04>] Here is listed the message log file:

[PeekTime] 1238596576 : Wed, 1 Apr 2009 23:36:16 +0900
<<
ErrCode = -41
ErrString = Bad server response
ErrInfo = 550-5.7.1 [124.51.110.141] The IP you're using to send mail is not authorized to
550-5.7.1 send email directly to our servers. Please use the SMTP relay at your
550-5.7.1 service provider instead. Learn more at http://mail.google
550 5.7.1 .com/support/bin/answer.py?answer=10336 t1si32280poh.21
SMAIL SMTP-Send MX = "gmail-smtp-in.l.google.com." SMTP = "beingmania.com" From = "****@****" To = "****@****" Failed !
SMTP-Error = "550-5.7.1 [124.51.110.141] The IP you're using to send mail is not authorized to
550-5.7.1 send email directly to our servers. Please use the SMTP relay at your
550-5.7.1 service provider instead. Learn more at http://mail.google
550 5.7.1 .com/support/bin/answer.py?answer=10336 t1si32280poh.21"
SMTP-Server = "gmail-smtp-in.l.google.com."
>>


[<05>] Here is listed the initial part of the message:

Received: from localhost ([127.0.0.1]:3791)
by beingmania.com with [XMail 1.22 PassKorea061024 ESMTP Server]
id for <****@****>from <****@****>;
Wed, 1 Apr 2009 23:36:16 +0900
MIME-Version: 1.0
To: ****@****
From: "PostMaster" <****@****>
Subject: Test
Date: Wed, 01 Apr 2009 23:36:16 +0900
Message-id: <****@****>
X-Mailer: Passkorea.NET Nmail Unix/Linux, Build 20070821
Content-Type: multipart/mixed;
boundary="=_c1e3e3440027dfb53e2f049aaa938d4a"

▷ 질문내용 : 검색을 해보았으나 상기와 같은 에러는 확인 힘들어서 확인 좀 부탁 드립니다.