Why are some people seeing an email error message saying - "The following organization rejected your message..."

We got a notification of a periodic email issue where the senders email gets rejected with the message below.  I'm not sufficiently experienced with this sort of thing to understand where the problem lies.  I'd appreciate it if someone could take a look and what, if anything, we can do to resolve it.

Thanks in advance
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Delivery has failed to these recipients or groups:

Moreau, Jenifer
Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept email from certain senders, or another restriction may be preventing delivery.

The following organization rejected your message: S15-GW104.mycloudmailbox.com.

Diagnostic information for administrators:

Generating server: S15-MBX101.S15.local

jmoreau@gsnetx.org
S15-GW104.mycloudmailbox.com
 Remote Server returned '<S15-GW104.mycloudmailbox.com #5.7.1 smtp;550 5.7.1 Rejected. Spam detected.>'

Original message headers:
Received: from S12-MBX11-11.S12.local (10.40.128.40) by S15-MBX101.S15.local
 (10.40.140.13) with Microsoft SMTP Server (version=TLS1_2,
 cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1415.2; Fri, 23
 Mar 2018 11:41:12 -0400
Received: from S12-MBX11-20.S12.local (10.40.128.49) by S12-MBX11-11.S12.local
 (10.40.128.40) with Microsoft SMTP Server (TLS) id 15.0.1365.1; Fri, 23 Mar
 2018 11:41:11 -0400
Received: from S12-MBX11-20.S12.local ([fe80::d1cb:675b:53f:5b8b]) by
 S12-MBX11-20.S12.local ([fe80::d1cb:675b:53f:5b8b%12]) with mapi id
 15.00.1365.000; Fri, 23 Mar 2018 11:41:11 -0400





From: Christina Stenger <christina@foyinc.com>
To: "Moreau, Jenifer" <jmoreau@gsnetx.org>
Subject: RE: 2018 Girl Scouts of Northeast Texas Annual Meeting materials
Thread-Topic: 2018 Girl Scouts of Northeast Texas Annual Meeting materials
Thread-Index: AdPB9R/Qly7HigNeRV+k4I7lGVteAwAx4lMQ
Date: Fri, 23 Mar 2018 15:41:11 +0000
Message-ID: <cb129bf4d87b4f39baa7ba79b1451658@S12-MBX11-20.S12.local>
References: <SN1PR0201MB1774A49683E92823846DC233D6A90@SN1PR0201MB1774.namprd02.prod.outlook.com>
In-Reply-To: <SN1PR0201MB1774A49683E92823846DC233D6A90@SN1PR0201MB1774.namprd02.prod.outlook.com>
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