안녕하세요 메일 문의 하나드립니다.

웹메일에서 아래와 같은 메일이 계속 들어온다고 합니다.

고객은 ****@****로 보낸적도 없고, 모르는 메일주소라고 하시구요. 
고객이 해외쪽에 메일보내고, 해외에서 답변하면 그 해외 고객한테도 동일한 메일이 들어간다고 합니다. 
어떤 문제가 있는지 확인요청드립니다. 

FW: Error sending message [***-****-*******-****-****64.226e80.eml] from [crony.kr] 

-----Original Message----- 
From: crony.kr PostMaster [mailto:****@****] 
Sent: Wednesday, July 01, 2020 2:46 PM 
To: ****@**** 
Subject: Error sending message [***-****-*******-****-****64.226e80.eml] from 
[crony.kr] 

[<00>] XMail bounce: Rcpt=[****@****];Error=[The maximum number 
of delivery attempts has been reached] 


[<01>] Error sending message [***-****-*******-****-****64.226e80.eml] from 
[crony.kr]. 

ID: <SE9B444D> 
Mail From: <****@****> 
Rcpt To: <****@****> 
Server: <checkoonpcb.com> [checkoonpcb.com] 


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

The maximum number of delivery attempts has been reached 


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

[PeekTime] ***-****-**** : Wed, 1 Jul 2020 14:36:38 +0900 
<< 
ErrCode = -40 
ErrString = Invalid server address 
ErrInfo = checkoonpcb.com 
SMAIL SMTP-Send FF = "checkoonpcb.com" SMTP = "crony.kr" From = "****@**** 
engineering.kr" To = "****@****" Failed ! 
SMTP-Error = "417 Temporary delivery error" 
SMTP-Server = "checkoonpcb.com" 
>> 
[PeekTime] ***-****-**** : Wed, 1 Jul 2020 14:38:41 +0900 
<< 
ErrCode = -40 
ErrString = Invalid server address 
ErrInfo = checkoonpcb.com 
SMAIL SMTP-Send FF = "checkoonpcb.com" SMTP = "crony.kr" From = "****@**** 
engineering.kr" To = "****@****" Failed ! 
SMTP-Error = "417 Temporary delivery error" 
SMTP-Server = "checkoonpcb.com" 
>> 
[PeekTime] ***-****-**** : Wed, 1 Jul 2020 14:40:49 +0900 
<< 
ErrCode = -40 
ErrString = Invalid server address 
ErrInfo = checkoonpcb.com 
SMAIL SMTP-Send FF = "checkoonpcb.com" SMTP = "crony.kr" From = "****@**** 
engineering.kr" To = "****@****" Failed ! 
SMTP-Error = "417 Temporary delivery error" 
SMTP-Server = "checkoonpcb.com" 
>> 
[PeekTime] ***-****-**** : Wed, 1 Jul 2020 14:43:14 +0900 
<< 
ErrCode = -40 
ErrString = Invalid server address 
ErrInfo = checkoonpcb.com 
SMAIL SMTP-Send FF = "checkoonpcb.com" SMTP = "crony.kr" From = "****@**** 
engineering.kr" To = "****@****" Failed ! 
SMTP-Error = "417 Temporary delivery error" 
SMTP-Server = "checkoonpcb.com" 
>> 
[PeekTime] ***-****-**** : Wed, 1 Jul 2020 14:45:38 +0900 
<< 
ErrCode = -40 
ErrString = Invalid server address 
ErrInfo = checkoonpcb.com 
SMAIL SMTP-Send FF = "checkoonpcb.com" SMTP = "crony.kr" From = "****@**** 
engineering.kr" To = "****@****" Failed ! 
SMTP-Error = "417 Temporary delivery error" 
SMTP-Server = "checkoonpcb.com" 
>> 


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

X-Deliver-To: ****@**** 
X-AuthUser: ****@**** 
Received: from TonyPC ([61.78.92.105]:7108) 
by crony.kr with [XMail 1.22 PassKorea120228 ESMTP Server] 
id <SE9B444D> for <****@****> from <****@**** 
engineering.kr>; 
Wed, 1 Jul 2020 14:36:37 +0900 
Message-ID: <****@****> 
From: "Tony Kang" <****@****> 
To: "Tony Kang" <****@****> 
Subject: Re: stamp 
Date: Wed, 1 Jul 2020 14:36:42 +0900 
MIME-Version: 1.0 
Content-Type: multipart/mixed; 
boundary="----=_NextPart_000_0071_01D64FB5.0A04CD10" 
X-Priority: 3 
X-MSMail-Priority: Normal 
Importance: Normal 
X-Mailer: Microsoft Windows Live Mail 15.4.3555.308 
X-MimeOLE: Produced By Microsoft MimeOLE V15.4.3555.308 

=======================================================

로그확인시 smtp , pop3 로그에는 heckoonpcb.com에 관한 로그는 없으며

smail 로그 확인시 아래 동일한 로그가 확인됩니다.

"crony.kr"      "***-****-*******-****-****56.2263bb.eml"   "SE9B3761"      "****@****" "****@****"       "REDIR" "****@****"  "2020-07-01 09:47:42"

확인부탁드립니다. 수고하세요