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Exchange 2010 - Mail being rejected - Firwall Error

I'm getting random emails being rejected from different client systems it seems.

Details:
I host my own Exchange 2010 server.  FQDN mail.sosrad.com

Here is a copy of the rejected email / NDR
DB3EHSMHS017.bigfish.com rejected your message to the following e-mail addresses:

BOYLAN MEDICAL ASSOC-BROWNING, 310 (kelly.rosinski@tpnmd.com) <mailto:kelly.rosinski@tpnmd.com> 


DB3EHSMHS017.bigfish.com gave this error:
Firewall Error 


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: Atlas.sos.local

kelly.rosinski@tpnmd.com
DB3EHSMHS017.bigfish.com #500 Firewall Error ##

Original message headers:

Received: from sosrad.com (172.0.1.181) by mail.sosrad.com (172.0.1.168) with  Microsoft SMTP Server id 14.0.722.0; Mon, 31 Oct 2011 11:16:42 -0400
Message-ID: <20111031151642183.LCMAZmyIM80Ct0DPAlZh@atlas.sos.local>
From: Southeastern Overread Services <reports@sosrad.com>
To: "BOYLAN MEDICAL ASSOC-BROWNING, 310" <kelly.rosinski@tpnmd.com>
Subject: Patient Report
Reply-To: <reports@sosrad.com>
Date: Mon, 31 Oct 2011 11:16:42 -0400
MIME-Version: 1.0
X-Priority: 1
X-MSMail-Priority: High
Content-Type: multipart/mixed;
	boundary="----_=_NextPart_000_00009F8F.02CD0EA0"
Return-Path: reports@sosrad.com
Received-SPF: None (savers.sos.local: reports@sosrad.com does not designate  permitted sender hosts)

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A few things that jump out at me...

1 Line 24:  It looks like my internal .local address is being used (atlas.sos.local) as my generating server.  When I check the send connected, the FQDN is listed as mail.sosrad.com
2 Line 44:  The "Received-SPF" at the very bottom is listing the "savers.sos.local" as not being a designated sender...  savers.sos.local is a NLB Cluster I run on my network of 2 servers and in no way is sending out any type of email.
0
Brian_Huff
Asked:
Brian_Huff
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1 Solution
 
Brian_HuffAuthor Commented:
This has happened rarely in the past few months, but as of this morning 10/31/2011 I'm seeing a TON of them from multiple different domains we're sending to and I can't think of a single thing that has changed on our servers.
0
 
Brian_HuffAuthor Commented:
Ah, I have found the issue!

The Exchange server had a second IP address assigned to it which was incorrectly listed with another server in my DNS Server
0
 
Brian_HuffAuthor Commented:
Issue Found
0

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