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▷ 제품버젼 : Nmail PHP 3.0.0 UTF-8

▷ 오류발생 메뉴/주소 :메일 발송 후 수신된 리턴 메일입니다.

▷ 에러메세지 :

-----Original Message-----
From: mta-nm02.dothome.co.kr PostMaster
[mailto:****@****]
Sent: Tuesday, February 11, 2020 10:48 AM
To: ****@****
Subject: Error sending message [1581385669182.140297434330880.700b.eml] from [mta-nm02.dothome.co.kr]

[<00>] XMail bounce: Rcpt=[****@****];Error=[550 5.7.1 Service unavailable; client [112.175.185.18] blocked using Cloudmark Sender Intelligence (Visit http://csi.cloudmark.com/reset-request/ if you feel this is in error.)]


[<01>] Error sending message [1581385669182.140297434330880.700b.eml] from [mta-nm02.dothome.co.kr].

ID:
Mail From: <****@****>
Rcpt To: <****@****>
Server: [62.209.50.26]


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

550 5.7.1 Service unavailable; client [112.175.185.18] blocked using Cloudmark Sender Intelligence (Visit http://csi.cloudmark.com/reset-request/
if you feel this is in error.)


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

[PeekTime] 1581385669 : Tue, 11 Feb 2020 10:47:49 +0900 <<
ErrCode = -82
ErrString = [RCPT TO:] not permitted by remote SMTP server
ErrInfo = 550 5.7.1 Service unavailable; client [112.175.185.18] blocked
using Cloudmark Sender Intelligence (Visit http://csi.cloudmark.com/reset-request/ if you feel this is in error.) SMAIL SMTP-Send MX = "mx1-eu1.ppe-hosted.com." SMTP = "mta-nm02.dothome.co.kr" From = "****@****" To = "****@****" Failed !
SMTP-Error = "550 5.7.1 Service unavailable; client [112.175.185.18] blocked using Cloudmark Sender Intelligence (Visit http://csi.cloudmark.com/reset-request/ if you feel this is in error.)"
SMTP-Server = "mx1-eu1.ppe-hosted.com."
>>


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

X-AuthUser: ****@****
Received: from DESKTOPU9I5KR7 ([175.193.191.221]:62885)
    by mta-nm02.dothome.co.kr with [XMail 1.22 PassKorea120228 ESMTP Server]
    id for <****@****> from <****@****>
    Tue, 11 Feb 2020 10:47:49 +0900
From: "George Whitfield" <****@****>
To: <****@****>
Cc: <****@****>
Subject: Request for Support
Date: Tue, 11 Feb 2020 10:47:50 +0900
Message-ID: <00e701d5e07d$44741610$cd5c4230$@halcyonsearch.com>
MIME-Version: 1.0
Content-Type: multipart/related;
    boundary="----=_NextPart_000_00E8_01D5E0C8.B45BBE10"
X-Mailer: Microsoft Outlook 15.0
Thread-Index: AdXgfN1dPuH+epULReS8wPOVy09rcA==
Content-Language: en-us

▷ 질문내용 : halcyonsearch.com 메일 서비스에서 메일 발송 후 해당 리턴 메일이 수신되어 문의가 접수되었습니다. 리턴메일 분석 페이지 상에 "550 5.7.1 Service unavailable" 키워드 검색 시 조회되는 내용이 없어, 어떤 문제인 지 조치 방안이 어떻게 될 지 확인 부탁 드리겠습니다.