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아래와 같은 메시지는 어떤 오류인가요 ?

-----Original Message-----
From: "formtec.co.kr PostMaster" <****@****>
Sent: 2016-04-07 14:23:26
To: ****@****
Subject: Error sending message [***-****-*******-****-****92.f7ec6.eml] from [formtec.co.kr]

[<00>] XMail bounce: Rcpt=[****@****];Error=[550 Mailbox not found. http://service.mail.qq.com/cgi-bin/help?subtype=1&amp;&amp;id=20022&amp;&amp;no=1000728]


[<01>] Error sending message [***-****-*******-****-****92.f7ec6.eml] from [formtec.co.kr].

ID: <S4CD0FC>
Mail From: <****@****>
Rcpt To: <****@****>
Server: <mx3.qq.com.> [mx3.qq.com.]


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

550 Mailbox not found. http://service.mail.qq.com/cgi-bin/help?subtype=1&amp;&amp;id=20022&amp;&amp;no=1000728


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

[PeekTime] ***-****-**** : Thu, 7 Apr 2016 14:23:26 +0900
<<
ErrCode = -82
ErrString = [RCPT TO:] not permitted by remote SMTP server
ErrInfo = 550 Mailbox not found. http://service.mail.qq.com/cgi-bin/help?subtype=1&amp;&amp;id=20022&amp;&amp;no=1000728
SMAIL SMTP-Send MX = "mx3.qq.com." SMTP = "formtec.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "550 Mailbox not found. http://service.mail.qq.com/cgi-bin/help?subtype=1&amp;&amp;id=20022&amp;&amp;no=1000728"' target="_blank">http://service.mail.qq.com/cgi-bin/help?subtype=1&amp;&amp;id=20022&amp;&amp;no=1000728"
SMTP-Server = "mx3.qq.com."
>>


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

X-AuthUser: ****@****
Received: from tsinghua.edu.cn ([106.6.130.119]:5146)
by formtec.co.kr with [XMail 1.22 PassKorea090507 ESMTP Server]
id <S4CD0FC> for <****@****> from <****@****>;
Thu, 7 Apr 2016 14:23:25 +0900
Date: Thu, 7 Apr 2016 13:17:40 +0800
From: =?utf-8?B?6YOR5LqR5Lqt?= <****@****>
To: <****@****>
Subject: =?utf-8?B?6buO5piV6KeB5oiR6KGM5LqR5rWB5rC055qE5LiA57O75YiX?=
Message-ID: <****@****>
X-Priority: 5 (Lowest)
X-mailer: Foxmail 6, 13, 102, 15 [cn]
Mime-Version: 1.0
Content-Type: multipart/alternative;
boundary="=====003_Dragon***-****-****4_====="