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Mail getting built up in queue

I have a MS Server 2003 w/SP1 and Exchange 2003 w/SP2.  I have recently upgraded my GFI Mail Essentials to version 10 and have noticed that my e-mails are getting built in in the messages pending queue.  Does anyone know a tool or something I can use to track this problem down.  I do get event id 4004 and 4015 when I restart the machine.  These have been going on for 6 mo (before I was here at this job) and they didn't have mail delivery problems then.  Thanks in advance for the help.
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j0s3ph
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j0s3ph
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amaheshwariCommented:
In one case, this happened on a Windows 2003 SP1 computer, which was a domain controller with Active Directory integrated zones, where the DNS Server address had defaulted to 127.0.0.1. Five of these Event IDs were preceded by EventID 4004 from source DNS.
Changing the DNS server address did not solve the problem. DNS was uninstalled and reinstalled (go to Control Panel -> Add/Remove Programs -> Add/Remove Windows Components -> Networking Services) without an intervening restart of the computer. The DNS Server was then checked and minor configuration changes made. The computer was restarted and EventID 4004 or 4015 did not reappear.
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j0s3phAuthor Commented:
I am also noticing that I am getting an event id of 3018 category: NDR.  I did forget to mention that this Exchange machine is in fact a Domain Controller as well. Is the best fix to remove and reinstall DNS?  I have done this on DC's, but not on an Exchange Server.
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amaheshwariCommented:
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j0s3phAuthor Commented:
I have not removed my DNS service yet.  I did notice that the error has been happening since late last year and we didn't have problems then.  We did upgrade from GFI mail essentials 9 to 12.  I noticed after that the mail queue would get built up up and after a while the website that is hosted off this machine slows in its response over time.  I wonder if there is something up with the upgrade of the SPAM software?
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j0s3phAuthor Commented:
I had this happen again and when I tried to restart the SMTP service it wouldn't stop.  I had to restart the machine.  I looked in the DNS logs and I have had any DNS errors at all this month.  I did  get an event id 3018, MS Exchange Transport (source), NDR (category) error close to when the messages pending submission (SMTP) queue.  But I have had these in the past and not had SMTP problems.  Are there any thoughts on this?  Apparently my problem is SMTP.
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Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
If this is a Small Business Server DO NOT remove your DNS.  You most likely have not run the Configure Email and Internet Connection Wizard  (CEICW).

And/Or your server is an open relay, or you have just been the target of a spammer using your domain as their return address.

Please see Sembee's article on how to fix the queue:  http://www.amset.info/exchange/spam-cleanup.asp

Jeff
TechSoEasy
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j0s3phAuthor Commented:
I have found the issue.  The previous admin had set the secondary dns forwarder and "fat fingered" the first octet of the DNS server.  So basically if the server ever had to resolve DNS off the second DNS forwarder the "Message pending queue" would get backed up because they where trying to resolve off of a false DNS server. Thanks for the help.  I will give credit to the person who mentioned the DNS problem.
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