My company has an Exchange Sever 2013. It stoppde to send/to receive external emails

Posted on 2014-08-27
Medium Priority
Last Modified: 2014-10-19
We only can send / receive internal emails.
I checked the inbound - outbound connectors : the server ip is correct

The CNAME record points to Microsoft EOP: autodicover.outlook.com   and clientconfig.microsoftonline-p.net
The MX record :xxxxx -com.mail.protection.outlook.com
please help
Question by:francisco Soto
  • 5
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LVL 27

Expert Comment

ID: 40291498
sending & receiving uses different facilities so treat them as separate issues until proved otherwise. bit odd theyd both at the same time tho....

firstly, has anyone (internal or external) had a boundback? these would be really useful to start with.

secondly, do you use any external mail filtering or smarthosts?

has you internet/firewall been changed or amended?

Author Comment

by:francisco Soto
ID: 40291668
yes we get bounback.

Received: from DTALL-EXCSRV002.DTC.dualtemp.com ( by
 DTALL-EXCSRV002.DTC.dualtemp.com ( with Microsoft SMTP Server
 (TLS) id 15.0.712.24 via Mailbox Transport; Wed, 27 Aug 2014 16:32:16 -0400
MIME-Version: 1.0
From: Microsoft Outlook
To: <administrator@dualtemp.com>
Date: Wed, 27 Aug 2014 16:32:16 -0400
Content-Type: multipart/report; report-type=delivery-status;
X-MS-Exchange-Organization-SCL: -1
Content-Language: en-US
Message-ID: <ff58e596-257a-4fe0-b7fa-5c9f949cf577@DTALL-EXCSRV002.DTC.dualtemp.com>
In-Reply-To: <a32a0fde0fba4ec79b3254a0bc0ada7a@DTALL-EXCSRV002.DTC.dualtemp.com>
References: <a32a0fde0fba4ec79b3254a0bc0ada7a@DTALL-EXCSRV002.DTC.dualtemp.com>
Thread-Topic: test
Thread-Index: AQHPwhJT4WFlcZqVLkSeZ3GSy4r+QJvk59ZN
Subject: Delivery delayed:test
Auto-Submitted: auto-replied
X-MS-Exchange-Organization-AuthSource: DTALL-EXCSRV002.DTC.dualtemp.com
X-MS-Exchange-Organization-AuthAs: Internal
X-MS-Exchange-Organization-AuthMechanism: 05
X-MS-Exchange-Organization-Network-Message-Id: 7b0aeb8b-b5b3-45af-f6b7-08d1904d2013
X-MS-Exchange-Organization-AVStamp-Enterprise: 1.0
Return-Path: <>
the external mail filtering is Microsoft Online Protection
the firewall is managed for level3. no changes

Author Comment

by:francisco Soto
ID: 40291683
Delivery has failed to these recipients or groups:

'fsoto18103@gmail.com' (fsoto18103@gmail.com)
 Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept email from certain senders, or another restriction may be preventing delivery.

The following organization rejected your message: DTALL-EXCSRV002.DTC.dualtemp.com.
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LVL 27

Expert Comment

ID: 40296956
you haven't specific whether these bouncebacks are incoming or outgoing.

could you also please advise if DTALL-EXCSRV002.DTC.dualtemp.com. is your server or someone elses?

Author Comment

by:francisco Soto
ID: 40297138
yes, this is our server.
both incoming and outgoing
we have internal mail flow perfect.
LVL 27

Assisted Solution

Steve earned 2000 total points
ID: 40322154
still a bit odd really. it is very rare that you would get the same issue both incoming and outgoing. is the bounceback message the same?

lets look at one issue at a time....

things to check on incoming:
receive connector - anonymous messages enabled
mailbox/disty group - 'require all senders to be authenticated' uncheckd
firewall - check port 25 goes to correct server

try running a manual test to confirm if traffic flows ok.

Accepted Solution

francisco Soto earned 0 total points
ID: 40359502
Issue fixed. It was a firewall issue.
From: smc@level3.com <smc@level3.com>
Sent: Thursday, September 4, 2014 4:20 PM
To: Francisco Soto

Subject: RE: Level (3) Ticket #: 8302553, Dual Temp Co. Inc.-Dual Temp Company, Inc., Ticket Updated, Customer Ticket ID:

Good afternoon,

The inbound nat object was not being called upon properly, once we adjusted the rule it allowed natting to take place properly. It was configured so that was reaching out over the external interface and when the traffic was coming back in the natted object was not being activated.

Very respectfully,

Charles Eakes
Level 3 Communications

Author Comment

by:francisco Soto
ID: 40365433
I've requested that this question be closed as follows:

Accepted answer: 0 points for francisco Soto's comment #a40359502

for the following reason:

LVL 27

Expert Comment

ID: 40365434
Bit  unfair to just accept your own solution there mate. In addition to the help I offered I also pointed you in the direction of the firewall in post 40322154.

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