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Why are some emails being held in th Exchange System Manager Queues?

Posted on 2010-11-10
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Last Modified: 2012-05-10
I recently changed our ISP from Verizon DSL to a Towerstream T1 and now I have some emails/domains being held in the Exchange System Manager Queue. I updated the IP that is hosting our domains so that isn't the cauise and did Reverse DNS entries on Towerstreams end for our domain. The only thing that has changed is that I removed the smart host address on the Exchange server since Towerstream serves doesn't require one.

Any ideas of why these aren't getting delivered???

Thanks
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Question by:csciarro
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Expert Comment

by:JBond2010
ID: 34104075
Did you test sending to the domains? You could try a telnet session and try to send an email eg:

Telnet mail.recipient's domain.com
helo mail.recipient's domain.com
mail from: <your email address>
rcpt to: <recipient's email address>
data
Subject: test email
.  this is a period press enter and this will display if the message is successful or not. If it is not successful you will receive an error message which will help you dianose the problem.

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Expert Comment

by:EndureKona
ID: 34104110
What are some of the messages in the queue?

Did you change the DNS forwarder from Verizon to Towerstream?
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Author Comment

by:csciarro
ID: 34104151
When I type telnet mail.laborlawupdates.com I get the following error message from the command prompt.....

"Could not open connection to host, on port 23: Connect failed:"
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Expert Comment

by:JBond2010
ID: 34104163
Sorry, it should telnet mail.laborlawupdates.com 25
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Author Comment

by:csciarro
ID: 34104213
Yes, I updated the Towerstream IP address with the company that is hosting our domain. I also did the Reverse DNS changes on Towerstreams end. How do I change the DNS forwarder from Verizon to Towerstream?

Thanks
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Expert Comment

by:JBond2010
ID: 34104268
In administrative tools open dns and right click on server name and select properties and then click on the forwarders tab. You can remove the forwarders and use Roots Hints, or use the DNS IP addresses of your new ISP.
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Expert Comment

by:EndureKona
ID: 34104333
I would recommend calling Towerstreams and asking them for the preferred DNS servers if you don't have it already and then put these in the forwarders.      This is to ensure you don't have any DNS issues.
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Author Comment

by:csciarro
ID: 34104337
Jbond,
I get the same error when I port 25 after the telnet command. Also, under the Forwarders Tab I have the following entry under DNS Domain: "All other DNS Domains" so do I keep this entry or do I add something else?
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Author Comment

by:csciarro
ID: 34104348
Ok. I have the Preferred and Secondary so should I add those?
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Expert Comment

by:JBond2010
ID: 34104358
If you are using Active Directory Intergrated Zone then you won't have a problem. In my previous comment, you can root hint or forwarders to the new ISP which I stated.
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Expert Comment

by:EndureKona
ID: 34104366
Yes add these to the DNS forwarders
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Expert Comment

by:EndureKona
ID: 34104372
Add the perferred DNS Ips that your ISP gives you to the forwarders.
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Expert Comment

by:JBond2010
ID: 34104383
Yes, add these. Optional, you don't have to use forwarders. It's depending on how you view your DNS infrastructure. You can use Root Hints which will do the same job as forwarders and your not relying on your ISP to provide DNS resolution.
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Author Comment

by:csciarro
ID: 34104420
Ok...Do I have to retart the Exchange Information Store after I add this IP Forward entry?
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Expert Comment

by:EndureKona
ID: 34104447
No you are good...it should start working right away...
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Expert Comment

by:JBond2010
ID: 34104473
You will be good to go now. You might want to clear the DNS cache.
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Expert Comment

by:JBond2010
ID: 34104482
The cache will have old entrie from your previous ISP. Go to the command prompt and type ipconfig /flushdns and then press enter, then type ipconfig /registerdns press enter.
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Author Comment

by:csciarro
ID: 34104488
How do I clear the DNS cache?
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Expert Comment

by:JBond2010
ID: 34104498
Go to administrative tools open DNS, right click on the server name and click on Clear DNS Cache.
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Author Comment

by:csciarro
ID: 34104524
Ok. I added the IP Forwarders and cleared the cache so I will wait a litlle and see if that email clears itself from the Queue
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Expert Comment

by:JBond2010
ID: 34104566
Good Stuff!
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Author Comment

by:csciarro
ID: 34104656
Ok..that domain is still retrying in the Queue..
Could there be an issue with that domain? I don't have any other domains being held for delivery.
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Expert Comment

by:JBond2010
ID: 34104670
That's why I was suggesting you try telnet on port 25 in my previous comment.
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Author Comment

by:csciarro
ID: 34104823
I tried the telnet and received the same error message for that domain name.
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Author Comment

by:csciarro
ID: 34115384
Any other suggestion on why I have to domains held in the Que?

Thanks
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Accepted Solution

by:
csciarro earned 0 total points
ID: 34138213
The answer to my own question after 3 days of research with the new ISP and company that hosts our site is that a SMTP relay address needs to be applied to the server to replace the Verizon smart host that was removed.
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Author Comment

by:csciarro
ID: 34148900
Ok. I applied the SMTP relay address and still having issues with receiving emails from some domains. Any other suggestions would be appreciated.

Thanks
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Author Closing Comment

by:csciarro
ID: 34179032
A smart host address needs to be applied to the Exchange server
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