Error sending message [1574138803494.140708321146624.b48b1.eml] from [ngelnet.com]

[<00>] XMail bounce: Rcpt=[****@****];Error=[550 5.7.1 The mail has been blocked as it contains a file attachment restricted by the administrator D2UUTpq6Q8WMJ1des20Cjw - nsmtp]

[<01>] Error sending message [1574138803494.140708321146624.b48b1.eml] from [ngelnet.com].

ID:        <S1BB54B>

Mail From: <****@****>

Rcpt To:   <****@****>

Server:    <mx1.naver.com> [125.209.238.100]

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

550 5.7.1 The mail has been blocked as it contains a file attachment restricted by the administrator D2UUTpq6Q8WMJ1des20Cjw - nsmtp

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

[PeekTime] 1574138803 : Tue, 19 Nov 2019 13:46:43 +0900 <<

ErrCode   = -162

ErrString = End of socket stream data

SMAIL SMTP-Send MX = "mx1.naver.com." SMTP = "ngelnet.com" From = "****@****" To = "****@****" Failed !

SMTP-Error = "550 5.7.1 The mail has been blocked as it contains a file attachment restricted by the administrator D2UUTpq6Q8WMJ1des20Cjw - nsmtp"

SMTP-Server = "mx1.naver.com."

>>

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

Received: from localhost ([127.0.0.1]:49050)

    by ngelnet.com with [XMail 1.22 PassKorea120228 ESMTP Server]

    id <S1BB54B> for <****@****> from <****@****>;

    Tue, 19 Nov 2019 13:46:43 +0900

MIME-Version: 1.0

To: ****@****

From: "=?utf-8?B?KOyjvCnrlJTsu6TrrqTri4jsvIDsnbTshZjspog=?=" <****@****>

Subject: =?utf-8?B?W0RDT01TXSDsnpDrj5nsi6Ttlokg6rSA66CoIOyekOujjCDssqjrtoA=?=

Date: Tue, 19 Nov 2019 13:46:43 +0900

Message-id: <****@****>

X-Mailer: Passkorea.NET Nmail PHP, Build 20130311

Content-Type: multipart/mixed;

    boundary="=_078275aaa0192a70fddb11a1035dbc61"