Requested gave this error: Denied by policy

Question

We recently installed Exchange Edge Transport on a server between our Exchange and our TMG and are receiving some previously unseen email bounces, please see below:
Requested rejected your message to the following e-mail addresses:
user at mcafee dot com 
Requested gave this error:
Denied by policy
A problem occurred during the delivery of this message to this e-mail address. Try sending this message again. If the problem continues, please contact your helpdesk.
Diagnostic information for administrators:
Generating server: EDGE.college.ac.uk
user at mcafee dot com
Requested #550 Denied by policy ##
Original message headers:
   Received: from EXCH1.college.ac.uk (10.0.1.12) by EDGE.college.ac.uk
(10.0.1.98) with Microsoft SMTP Server (TLS) id 14.2.347.0; Thu, 24 Apr 2014
12:11:26 +0100
Received: from EXCH1.college.ac.uk ([10.0.1.12]) by EXCH1.college.ac.uk
([10.0.1.12]) with mapi id 14.02.0247.003; Thu, 24 Apr 2014 12:11:26 +0100
From: "Shunnar, Saber" <user at Lowestoft.ac.uk>
To: "user at mcafee dot com
" <user at mcafee dot com
>
Subject: High risk mail srver remove request
Thread-Topic: High risk mail srver remove request
Thread-Index: Ac9fre5VPELKTwiyR2G/2FrKw/zq7Q==
Date: Thu, 24 Apr 2014 11:11:25 +0000
Message-ID: <>
Accept-Language: en-GB, en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-originating-ip: [10.0.30.3]
Content-Type: multipart/alternative;
            boundary="_000_81BDB8D50CF42D4BB9B163C04FA31C8972A28150EXCH1collegeacu_"
MIME-Version: 1.0
Return-Path:
It doesn't seem clear what is generating the message? has anyone seen this before?
Thank you in advance for your help.

Answer 1

Hello,
Please check if some users from other external domains send message to your organization, the issue also occurs. If the issue occur on specific domain or sender , please check your sender filter agent.
Or disable anti-spam agent temporarily to check the result.
Cara Chen
TechNet Community Support