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

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
csciarroAsked:
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csciarroConnect With a Mentor Author Commented:
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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JamesSenior Cloud Infrastructure EngineerCommented:
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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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
What are some of the messages in the queue?

Did you change the DNS forwarder from Verizon to Towerstream?
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csciarroAuthor Commented:
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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JamesSenior Cloud Infrastructure EngineerCommented:
Sorry, it should telnet mail.laborlawupdates.com 25
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csciarroAuthor Commented:
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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JamesSenior Cloud Infrastructure EngineerCommented:
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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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
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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csciarroAuthor Commented:
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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csciarroAuthor Commented:
Ok. I have the Preferred and Secondary so should I add those?
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JamesSenior Cloud Infrastructure EngineerCommented:
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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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
Yes add these to the DNS forwarders
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
Add the perferred DNS Ips that your ISP gives you to the forwarders.
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JamesSenior Cloud Infrastructure EngineerCommented:
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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csciarroAuthor Commented:
Ok...Do I have to retart the Exchange Information Store after I add this IP Forward entry?
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
No you are good...it should start working right away...
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JamesSenior Cloud Infrastructure EngineerCommented:
You will be good to go now. You might want to clear the DNS cache.
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JamesSenior Cloud Infrastructure EngineerCommented:
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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csciarroAuthor Commented:
How do I clear the DNS cache?
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JamesSenior Cloud Infrastructure EngineerCommented:
Go to administrative tools open DNS, right click on the server name and click on Clear DNS Cache.
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csciarroAuthor Commented:
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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JamesSenior Cloud Infrastructure EngineerCommented:
Good Stuff!
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csciarroAuthor Commented:
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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JamesSenior Cloud Infrastructure EngineerCommented:
That's why I was suggesting you try telnet on port 25 in my previous comment.
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csciarroAuthor Commented:
I tried the telnet and received the same error message for that domain name.
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csciarroAuthor Commented:
Any other suggestion on why I have to domains held in the Que?

Thanks
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csciarroAuthor Commented:
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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csciarroAuthor Commented:
A smart host address needs to be applied to the Exchange server
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