Header info - Why is this getting a SCL rating of 9?

Hey Experts.
Hope someone can help with this

I'm trying to work out WHY each newsletter sent via my clients webhosting company is getting an SCL rating of 9, and therefore not getting through Office 365 and going to Junk.  

Stats show very few emails are being read by reciepients.  The developer is playing dumb, so I want some ammo, facts on how he can improve his newsletter system.

Source server IP doesn't show up on any blacklists.
SPF is OK.

whitelisting IP addresses or domains on my Office 365 is not my answer,  I'm after reasons WHY SCL rating is so high if possible.

Following  is the header info for the message . Thanks for any tips!!.. Cheers Tom


Received: from SINPR02MB201.apcprd02.prod.outlook.com (10.141.112.11) by
SINPR02MB204.apcprd02.prod.outlook.com (10.141.112.26) with Microsoft SMTP
Server (TLS) id 15.1.118.21 via Mailbox Transport; Thu, 19 Mar 2015 22:36:52
+0000
Received: from TY1PR0201CA0006.apcprd02.prod.outlook.com (25.164.90.144) by
SINPR02MB201.apcprd02.prod.outlook.com (10.141.112.11) with Microsoft SMTP
Server (TLS) id 15.1.118.21; Thu, 19 Mar 2015 22:36:50 +0000
Received: from AM1FFO11FD043.protection.gbl (2a01:111:f400:7e00::139) by
TY1PR0201CA0006.outlook.office365.com (2a01:111:e400:5971::16) with Microsoft
SMTP Server (TLS) id 15.1.118.21 via Frontend Transport; Thu, 19 Mar 2015
22:36:48 +0000
Received: from mx193.a.outbound.createsend.com (203.55.21.193) by
AM1FFO11FD043.mail.protection.outlook.com (10.174.64.232) with Microsoft SMTP
Server id 15.1.125.13 via Frontend Transport; Thu, 19 Mar 2015 22:36:47 +0000
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; s=cs2015; d=cmail20.com;
h=From:To:Reply-To:Date:Subject:MIME-Version:Content-Type:List-Unsubscribe:Sender:Message-ID; i=dixie=3Dclientdomainmasked.com@cmail20.com;
bh=Rm9OuJ0YhskMgPO9xwZa2zxo5pg=;
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tIXJgLXwq3eFFCzf1Qw=
From: "ClientName" <dixie@clientdomainmasked.com>
To: "bob@clientdomainmasked.com" <bob@clientdomainmasked.com>
Reply-To: dixie@clientdomainmasked.com
Date: Fri, 20 Mar 2015 09:36:46 +1100
Subject: Only 48 tickets left for the Property Management event of 2015 - Preview
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="_41ee379d-a6a8-4a61-83b3-1b8c33b318cd_"; charset=utf-8
X-Mailer: Create Send
X-Complaints-To: abuse@cmail20.com
X-Feedback-ID: CA1-r-qddtko:LI1-r-l:CL1-r-ykef:createSEND
List-Unsubscribe: <http://unsub.cmail20.com/t/r-u-qddtko-l/>,
Sender: "ClientName" <dixie=clientdomainmasked.com@cmail20.com>
Message-ID: <cm.093646.qddtko.l.r@cmail20.com>
Return-Path: preview@cmail20.com
X-MS-Exchange-Organization-Network-Message-Id: 6ff30c99-c45f-4d94-642a-08d230ac51ac
X-EOPAttributedMessage: 0
X-MS-Exchange-Organization-MessageDirectionality: Incoming
Received-SPF: Pass (protection.outlook.com: domain of cmail20.com designates
203.55.21.193 as permitted sender) receiver=protection.outlook.com;
client-ip=203.55.21.193; helo=mx193.a.outbound.createsend.com;
Authentication-Results: spf=pass (sender IP is 203.55.21.193)
smtp.mailfrom=preview@cmail20.com; clientdomainmasked.com; dkim=pass (signature was
verified) header.d=cmail20.com;clientdomainmasked.com; dmarc=none action=none
header.from=clientdomainmasked.com;
X-Forefront-Antispam-Report: CIP:203.55.21.193;CTRY:AU;IPV:NLI;EFV:NLI;SRV:BULK;SFV:SPM;SFS:(6039001)(438002)(1900300002)(349012);DIR:INB;SFP:;SCL:9;SRVR:SINPR02MB201;H:mx193.a.outbound.createsend.com;FPR:;SPF:Pass;MLV:ovrnspm;MX:1;A:1;PTR:mx193.a.outbound.createsend.com;LANG:en;
X-DkimResult-Test: Passed
X-Microsoft-Antispam: UriScan:;BCL:4;PCL:0;RULEID:(240001)(3001015)(70001);SRVR:SINPR02MB201;
X-MS-Exchange-Organization-AVStamp-Service: 1.0
X-Exchange-Antispam-Report-Test: UriScan:;
X-Exchange-Antispam-Report-CFA-Test: BCL:4;PCL:0;RULEID:(601004)(5010005)(5011007);SRVR:SINPR02MB201;BCL:4;PCL:0;RULEID:;SRVR:SINPR02MB201;
X-MS-Exchange-Organization-SCL: 9
X-CustomSpam: Bulk Mail
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Mar 2015 22:36:47.2769
(UTC)
X-MS-Exchange-CrossTenant-Id: ae61a177-666f-45bc-b65f-34ace0fc6ce2
X-MS-Exchange-CrossTenant-FromEntityHeader: Internet
X-MS-Exchange-Transport-CrossTenantHeadersStamped: SINPR02MB201
X-MS-Exchange-Organization-AuthSource: AM1FFO11FD043.protection.gbl
X-MS-Exchange-Organization-AuthAs: Anonymous
X-MS-Exchange-Transport-EndToEndLatency: 00:00:05.5987176