Issue receiveing emails from certain mail servers. eg Office365 & Outlook.com

I am having issues with emails sent to one of my customers (SBS2003 / Exchange 2003 (Version: 6.5.7638.1).

I have asked for any NDR's to be sent to me and this is what they are saying:

XXXX@XXXX.com
9/6/2015 12:32:24 PM - Remote Server at mail1.XXXX.com (XXXX) returned '550 4.4.7 QUEUE.Expired; message expired'
9/6/2015 12:12:19 PM - Remote Server at mail1.XXXX.com (XXXX) returned '451 4.4.0 SMTPSEND.SuspiciousRemoteServerError; remote server disconnected abruptly; retry will be delayed'

Original message headers:
 
Received: from DB5PR04MB1301.eurprd04.prod.outlook.com (10.162.156.155) by
 DB5PR04MB1303.eurprd04.prod.outlook.com (10.162.156.157) with Microsoft SMTP
 Server (TLS) id 15.1.262.15; Fri, 4 Sep 2015 12:29:47 +0000
Received: from DB5PR04MB1301.eurprd04.prod.outlook.com ([10.162.156.155]) by
 DB5PR04MB1301.eurprd04.prod.outlook.com ([10.162.156.155]) with mapi id
 15.01.0262.011; Fri, 4 Sep 2015 12:29:47 +0000

I applied Hotfix 948963 (https://support.microsoft.com/en-us/kb/948963) last night but this stopped emails being received from my Exchange 2007 Server. I have since removed this and emails are being delivered again.

Any help would be appreciated.

Many thanks.
KubicAsked:
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KimputerCommented:
I'm suspecting you're using a third party filter/firewall software/hardware solution? In that case, you have to check the rules if there's anything you can whitelist MS servers.
KubicAuthor Commented:
Thank you for your comment. I have no third party filters running. The firewalls don't seem to be an issue either.
Does that mean whitelisting all MS 3rd party Servers manually? Is there a list of the ones used?
Thanks again.
KimputerCommented:
Probably whitelisting it manually is the fastest solution right now. There's no real list, only subdomains as listed in their SPF record:

        "v=spf1 include:spf-a.outlook.com include:spf-b.outlook.com ip4:157.55.9
.128/25 include:spf.protection.outlook.com include:spf-a.hotmail.com include:_sp
f-ssg-b.microsoft.com include:_spf-ssg-c.microsoft.com ~all"

Each entry has it's own entry again, for example, the first hostname gives you:
        "v=spf1 ip4:157.56.232.0/21 ip4:157.56.240.0/20 ip4:207.46.198.0/25 ip4:
207.46.4.128/25 ip4:157.56.24.0/25 ip4:157.55.157.128/25 ip4:157.55.61.0/24 ip4:
157.55.49.0/25 ip4:65.55.174.0/25 ip4:65.55.126.0/25 ip4:65.55.113.64/26 ip4:65.
55.94.0/25 -all"

So you need to add quite a few things.

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KubicAuthor Commented:
Thank you.
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