When trying to send SMTP emails to hotmail accounts from our server we are getting the following undeliverable responses:

Delivery has failed to these recipients or groups:

 

*** Email address is removed for privacy ***
A communication failure occurred during the delivery of this message. Please try resending the message later. If the problem continues, contact your helpdesk.

 

 

Diagnostic information for administrators:

 

Generating server: BAY0-MC1-F32.Bay0.hotmail.com

 

*** Email address is removed for privacy ***
#< #5.5.0 smtp;550 Mailbomb Target> #SMTP#

 

Original message headers:

 

Received: from s15430425.onlinehome-server.info ([82.165.148.208]) by
 BAY0-MC1-F32.Bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4900);           Wed, 7
 Aug 2013 19:28:30 -0700
Received: from s15430425 ([127.0.0.1]) by s15430425.onlinehome-server.info
 with Microsoft SMTPSVC(7.5.7601.17514);          Thu, 8 Aug 2013 03:28:28 +0100
thread-index: Ac6T3vZ8K5Osh0aQS5e1Mkd+mnxPJg==
Thread-Topic: Callidus Jobs Registration
From: callidusjobs.com <*** Email address is removed for privacy ***>
To: Vivianb <*** Email address is removed for privacy ***>
Subject: Callidus Jobs Registration
Date: Thu, 8 Aug 2013 03:28:27 +0100
Message-ID: <B8355645E2BD4333971D30C9D5A3D6B4@s15430425>
MIME-Version: 1.0
Content-Type: multipart/alternative;
            boundary="----=_NextPart_000_0000_01CE93E7.586E86D0"
X-Mailer: Microsoft CDO for Windows 2000
Content-Class: urn:content-classes:message
Importance: normal
Priority: normal
X-MimeOLE: Produced By Microsoft MimeOLE V6.1.7601.17609
Return-Path: *** Email address is removed for privacy ***
X-OriginalArrivalTime: 08 Aug 2013 02:28:28.0286 (UTC) FILETIME=[F763D1E0:01CE93DE]
X-MS-Exchange-Organization-AVStamp-AVG: 2012.0.2242 [3209.1.1/6058];0;
X-MS-Exchange-Organization-AVStamp-Mailbox: AVGESE;9267;0;

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