Remote Server returned ‘< #5.0.0 smtp; 550-Please turn on SMTP Authentication in your mail client.

I need a solution

We are not receiving email from a company that uses Message Labs and we use Proofpoint. We do not see the email hitting Proofpoint at all. Proofpoint does NOT require SMTP authentication.

Is this a Messagelab configruation issue?

Thank you!

Here is the header info, stripped of personal data:

Delivery has failed to these recipients or groups:
MyClient@myclient.com

A problem occurred while delivering this message to this email address. Try sending this message again. If the problem continues, please contact your helpdesk.

Diagnostic information for administrators:
Generating server: server-2.bemta.az-a.us-west-2.aws.symcld.net
MyClient@myclient.com
Remote Server returned ‘< #5.0.0 smtp; 550-Please turn on SMTP Authentication in your mail client. >’

Original message headers:
Return-Path: <TheSender@sender.com>
Received: from [xx.yy.zz.aa] (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256 bits))
    by server-2.bemta.az-a.us-west-2.aws.symcld.net id 1C/63-27934-3AB50BD5; Wed, 23 Oct 2019 13:54:43 +0000
X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrOKsWRWlGSWpSXmKPExsUy45Bij+6i6A2
  xBkcvaVj83TiBzaJ1/zc2ByaPvkVv2QIYo1gz85LyKxJYMy7u3M5U8HUBY8W9L/+YGhhvz2Hs
  YuTiEBLYwSix7+gSti5GTiBnP6PEuY8yIDabgIPEpe37WEFsEQF3iXctTUxdjBwcwgKSEqvf+
  YKYIgJSEivv8UFUGEn86HzBBhJkki68FiTMK+Am0bPuAwuIzSggJvH91BomEJtZQFzi1p
  P5YLaEgIjEw4un2SBsUYmXj/+xQtgGEluX7mOBsBUldv75zwLRmyLx4NZ6Roj5ghInZz5hmcA
  oOAvJ2FlIymYhKYOIZ0lcnNPPDGHrSCzY/YkNwtaWWLbwNTOMfebAYyZUcQ4gO1mib3oyRFhe
  YtLP7UCtXED2MkaJjdMOQfUqSkzpfsi+gJFnFaNFUlFmekZJbmJmjq6hgYGuoaGRrqGRha6hq
  bleYpVuol5psW55anGJrpFeYnmxXnFlbnJOil5easkmRmDcphQ0zN3B+PbIa71DjJIcTEqivK
  mn1scK8SXlp1RmJBZnxBeV5qQWH2KU4eBQkuA1itwQKyRYlJqeWpGWmQNMITBpCQ4eJRHeGyB
  p3uKCxNzizHSI1ClGV44JL+cuYuY4eHQekPy4agmQ/A4m2zcCSSGWvPy8VClx3hMgzQIgzRml
  eXCjYenvEqOslDAvIwMDgxBPQWpRbmYJqvwrRnEORiVh3qgooCk8mXklcBe8AjqOCeg4Of71I
  MeVJCKkpBqYFGYYzhMUs5+t7xzGFLpItED86wSdllkNdjEG68PD4nNfpCtV/YlSVltx9v8bg/
  uZwp3aBrP6nuSd+nb2r85Fn2BJ/91P9z7+MfHBmbDSxBSDx5J8nfUsKzbZn/31R1psfv1XNc9
  aVg07ffUNr1MNp3lazf8UGMzv9vAn44+/Snu2vOe7zrp7z3Sjov9CleYTFKVYv5i2P59gPylE
  /pUdc01+pmqTR4q+XOaH8oT0GVK5dasnNijtZrkru/8c4+JdcWs+LPX4nGbobda4gX+e4Zw40
  2OnHhWoBV+9eJmLtY3Z7pDs7QOWK8T+pVjEFYr8C+/c8iXkame0PfvxdE3NOy/fT1i7Y8ccUZ
  bXM7qVWIozEg21mIuKEwHMKYbv+gMAAA==
X-Env-Sender: TheSender@sender.com
X-Msg-Ref: server-11.tower-331.messagelabs.com!1571838881!115107!1
X-Originating-IP: [111.222.333.444]
X-SYMC-ESS-Client-Auth: outbound-route-from=pass
X-StarScan-Received:
X-StarScan-Version: 9.43.12; banners=-,-,-
Received: (qmail 7940 invoked from network); 23 Oct 2019 13:54:42 -0000
Received: from ptr1.sender.com (HELO mail.sender.com) (111.222.333.444)
  by server-11.tower-331.messagelabs.com with ECDHE-RSA-AES256-SHA384 encrypted SMTP; 23 Oct 2019 13:54:42 -0000
Received: from SENDER-EXCH-03.SENDER.COM (111.222.333.113) by
 SENDER-EXCH-02.SENDER.com (111.222.333.112) with Microsoft SMTP Server (TLS) id
 15.0.1497.2; Wed, 23 Oct 2019 08:54:17 -0500
Received: from SENDER-EXCH-03.SENDER.COM ([fe80::49aa:4b74:6495:96d4]) by
 SENDER-EXCH-03.SENDER.com ([fe80::49aa:4b74:6495:96d4%13]) with mapi id
 15.00.1497.000; Wed, 23 Oct 2019 08:54:17 -0500
From: “Sender, Sender” <TheSender@sender.com>
To: Person 1<MyClient@myclient.com>, Person 2 <SNoel@myclient.com>
Subject: FW: Sales
Thread-Topic: Sales
Thread-Index: AdWJqEYIueyQsz8ypTwSTmmWe97H46wAAQ94g
Date: Wed, 23 Oct 2019 13:54:16 +0000
Message-ID: <363823bb7f0b4b0a8d0205f8cfa2287f@SENDER-EXCH-03.SENDER.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
x-ms-exchange-transport-fromentityheader: Hosted
x-originating-ip: [10.1.10.100]
Content-Type: text/plain
MIME-Version: 1.0

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