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URGENT - SBS 2008 not sending and receiving email

Posted on 2011-08-09
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Last Modified: 2012-06-27
I have a SBS 2008 with exchange 2007 not receiving and sending email

This the error I see in the queue
451 4.4.0 primary target ip address responded with 421 4.2.1 unable to connect

Everything was working fine until this morning when my customer called to let me know he was not receiving any emails. After I did a test I see that he is not receiving any emails either.
The email that the users are trying to send are all in the queue

Please help.
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Comment
Question by:Gerhardpet
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16 Comments
 
LVL 1

Author Comment

by:Gerhardpet
ID: 36338204
I meant to say that the users can't send any emails either.
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LVL 11

Expert Comment

by:madhatter5501
ID: 36338208
check for any updates that were applied overnight, and uninstall to get back to how it was yesterday, check the firewall as well and that no port mapping on the firewall has been changed
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LVL 1

Author Comment

by:Gerhardpet
ID: 36338223
I don't see any update that installed since August the 4th
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LVL 11

Expert Comment

by:madhatter5501
ID: 36338251
you can ping the server internally?  externally?  have the mx records changed?  check the send connector to the internet - are you using dns or smarthost?
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LVL 1

Author Comment

by:Gerhardpet
ID: 36338269
MX records have not changed and yes I can ping server internally and externally

Using smart host from DNS Made easy
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LVL 11

Expert Comment

by:madhatter5501
ID: 36338281
have you rebooted the server?
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LVL 11

Expert Comment

by:madhatter5501
ID: 36338287
have you contacted the smart host provider to see if they are seeing the emails that you are sending?
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LVL 1

Author Comment

by:Gerhardpet
ID: 36338301
no reboot yet...I have 6 users active on a ERP system database that resides on the server.
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LVL 38

Expert Comment

by:Hypercat (Deb)
ID: 36338316
Do you have any antispam or antivirus software running on these servers?
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LVL 38

Expert Comment

by:Hypercat (Deb)
ID: 36338325
This sounds like a DNS issue. Are you using forwarders on your SBS server in the DNS settings?  If so, I would recommend removing the forwarders (you do not actually need them) and see if that resolves the issue.
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LVL 1

Author Comment

by:Gerhardpet
ID: 36338326
no...just an untangle firewall that does the spam filtering and virus blocking
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LVL 38

Expert Comment

by:Hypercat (Deb)
ID: 36338593
So you have resolved the issue on your own?
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LVL 1

Accepted Solution

by:
Gerhardpet earned 0 total points
ID: 36338608
I rebooted the server and now it works again

I'm not sure what the problem was
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LVL 38

Expert Comment

by:Hypercat (Deb)
ID: 36338650
OK - it's good that you got it working again at any rate.  Cheers!
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LVL 1

Author Comment

by:Gerhardpet
ID: 36394404
I' have been monitoring the server and it is working fine now. Now sure what the problem was.
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LVL 1

Author Closing Comment

by:Gerhardpet
ID: 36413528
Problem solved with rebooting
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