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▷ 에러메세지 :

From: "knlsys.net PostMaster" <****@****>
Sent: 2014-04-18 09:38:32
To: ****@****
Subject: Error sending message [***-****-*******-****-****64.26324.eml] from [knlsys.net]

[<00>] XMail bounce: Rcpt=[****@****];Error=[554 5.7.1 This message has been blocked because the HELO/EHLO domain is invalid.]


[<01>] Error sending message [***-****-*******-****-****64.26324.eml] from [knlsys.net].

ID: <SA653E>
Mail From: <****@****>
Rcpt To: <****@****>
Server: <excn.tungthih.com.cn> [110.80.18.180]


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

554 5.7.1 This message has been blocked because the HELO/EHLO domain is invalid.


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

[PeekTime] ***-****-**** : Fri, 18 Apr 2014 09:38:29 +0900
<<
ErrCode = -162
ErrString = End of socket stream data
SMAIL SMTP-Send MX = "excn.tungthih.com.cn." SMTP = "knlsys.net" From = "****@****" To = "****@****" Failed !
SMTP-Error = "554 5.7.1 This message has been blocked because the HELO/EHLO domain is invalid."
SMTP-Server = "excn.tungthih.com.cn."
>>


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

X-AuthUser: ****@****
Received: from [192.168.110.104] ([192.168.110.104]:1441)
by knlsys.net with [XMail 1.22 PassKorea120228 ESMTP Server]
id <SA653E> for <****@****> from <****@****>;
Fri, 18 Apr 2014 09:38:29 +0900
Message-ID: <****@****>
Date: Fri, 18 Apr 2014 09:38:30 +0900
From: =?UTF-8?B?7JWI64Ko6riw?= <****@****>
User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:24.0) Gecko/20100101 Thunderbird/24.4.0
MIME-Version: 1.0
To: =?UTF-8?B?IuWOpumXqOmUgOWUruWkhOabvuS4veWQm0NhbmRpY2UgWmVuZyhUVEUtWGlh?=
=?UTF-8?B?bWVuIDY2OS0yMDEzMDMpIg==?= <****@****>
Subject: Re: =?UTF-8?B?562U5aSNOiDnrZTlpI06IOetlOWkjTogT3JkZXIgZm9yIE0yeHg=?=
=?UTF-8?B?IFNlbnNvciAmIEJyYWNrZXQgZm9yIFBQViBCdWlsZA==?=
References: <****@****> <****@****> <****@****> <****@****> <****@****> <****@****> <****@****> <****@****>
In-Reply-To: <****@****>
Content-Type: multipart/alternative;
boundary="------------***-****-*******-****-****06" 

▷ 질문내용 :

DNS관련 내용인지..잘모르겠네요.무슨문제인가요?