Exchange server delay delivery to all out of organization emails


I am in need of some major help.  The exchange server is sending email within our organization but it is not sending or receiving mail outside our organization.

Its Exchange 2010 running on a 2008 R2 server.

I am not sure what services or protocols to check.

Please advise.

Thank you !!!
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Patrick BogersDatacenter platform engineer LindowsCommented:

Did it work before?
James HIT DirectorCommented:
Test the server connectivity from outside.

Run inbound tests first. Post results.

Verify MX records.
MeowserMAuthor Commented:
yes it has been working for years.  Seemed to stop at 6PM last night
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Patrick BogersDatacenter platform engineer LindowsCommented:
Hi again,

Ok great, there can be some issues, first that comes to mind, is this server multihomed? One NIC goes to the internal network and second NIC connects to internet?

If so, does the server have a working internet connection?
If so? what is there to see in the event logs close to when it stopped working?

Last for this post, were there around this time updates installed? Windows updates, AV or malwaretools updates?
MeowserMAuthor Commented:
Inbound test failed:

Testing inbound SMTP mail flow for domain ''.

The Microsoft Connectivity Analyzer failed to test inbound SMTP mail flow.

Additional Details

Test Steps
MeowserMAuthor Commented:
Yes we can get to the internet on that server.
We did see an critical event log where the server rebooted but that was much later in the night after the issue began.
Last updates looks like 12/16/2013 and it has been restarted several times since then
David Paris VicenteInfrastructure DesignerCommented:
The users are receiving NDR messages?

I would do some tests as below:
 1. run exbpa on the exchange server, confirm whether there are some useful information
 2. use get-rereceiveconnector and post them here, we could check and do more research about your issue
 3. use telnet to connect your exchange server from internet, cnfirm it is ok, if there is some information, please post it here

Can you confirm that the Connectors has the anonymous permissions selected.
Patrick BogersDatacenter platform engineer LindowsCommented:
Could you temporarily disable AV and other malwaretools and firewall to check connectivity?

Wouldnt be the first time we see an AV update block communication for Exchange.
MeowserMAuthor Commented:
I ran the MX tool check it is doesn't look like we are blacklisted
David Paris VicenteInfrastructure DesignerCommented:
Did you try to restart the microsoft Exchange transport service and check again if the problem conitnues?
MeowserMAuthor Commented:
Yes the users are receiving NDR messages

I will attempt to run the tests suggested
MeowserMAuthor Commented:
we are restarting the transport service right now
MeowserMAuthor Commented:
We think it might be the barracuda.  checking that right now
MeowserMAuthor Commented:
does anyone know how I can bypass the barracuda because we have verified that it is the barracuda.
Patrick BogersDatacenter platform engineer LindowsCommented:
Do you have your own appliance or use a barracuda supplier?
MeowserMAuthor Commented:
We have our own Baraccuda 300.  I don't know anything about this other than it's IP address.  I was not here when it was installed
Patrick BogersDatacenter platform engineer LindowsCommented:
In organisation Configuration in ESM click on Hub Transport and look for the send connector.
There is an option 'Route mail through the following smart hosts' with the ip adress for the appliance. Empty it and under Network-> route mail through following smart hosts you can specify the SMTP server from your ISP.

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MeowserMAuthor Commented:
I was not able to bypass the barracuda but I think it may be because I do not have the right IP address.   I will post results a little later.

Thank you all for your help.

Patricker1972 - you are awesome....Thank you !
Patrick BogersDatacenter platform engineer LindowsCommented:
Youre welcome, glad i can help.
MeowserMAuthor Commented:
Thanks again for everyone's help. We are getting a replacement barracuda because it was a total hardware failure. I had to redirect the email to and from the router as you suggested but the router had some rules on it that I didn't understand so I got some outside help to accomplish the router changes.   I will assign points tomorrow. But thanks again for the help
MeowserMAuthor Commented:
This solution worked for me
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