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Exchange 2010 FQDN when telnet port 25

Posted on 2011-04-22
Medium Priority
Last Modified: 2012-05-11
I am migrating from Ex2003.  In Ex2003 I remember changing the FQDN that was presented when I would telnet to port 25 on the local box. I created a reverse pointer record in DNS that matched the name present in my banner header.
In other words I would telnet to port 25 and it would come back mail.myserver.com. Then I created a reverse PTR record in DNS to point mail.myserver.com back to the IP of my mail server. This was needed because certain mail servers would not accept mail until I did it.
I am having problems doing this in Exchange 2010. I go to Server Config->Hub Transport-> Receive Connectors.  I am not able to put in my FQDN into the Default Connector. The only name it will accept is my local AD domain name (ie  exchange2010.myserver.lcl).  Since this is not a FQDN, how do I enter one in to keep the other mail servers on the net happy?
Hope I was clear on this.

Question by:nachtmsk
LVL 10

Expert Comment

ID: 35452556
Will you please clearify your needs, as far as I understood your problem you wanted to start your mails from exchange 2010,for this you don't need to modify your default connectors for exchange 2003 bcoz there is an routing group connector automatically been created at the time of coexistance with exchange 2003 and this will start your mail flow from exchange 2010.

Expert Comment

ID: 35452660
If you are reffering to the reverse DNS lookup then you need to publish/Set at your ISP level, not your local DNS level.. get in touch with your ISP for that

Expert Comment

ID: 35452871
I'm sorry, I guess I wasn't clear. I don't know the correct terminology. So I will explain better.
I have an Exchange 2010 server. I DID have an Exchange 2003 server but I am taking that offline. I am talking about my Exchange 2010 server and how it communicates with other EXTERNAL servers when making an SMTP connection.

More specifically:
When a mail server connects to another external mail server it often checks what the HELO FQDN name is. You can test what this is by doing a telnet localhost 25. The FQDN that is brought back is what other mail servers will see. This FQDN that is brought back needs to have a reverse pointer entered into DNS of the local ISP (or server provider as in my case: Rackspace). If the FQDN reported by the server in the HELO banner isn't the same as the reverse pointer DN, then the other mail server sometimes will reject the mail.
In Ex2003 it was easy to change what the FQDN was that was reported by the current mail server. All I had to do was going into the SMTP connector and change the name.
In Ex2010 though it doesn't seem to easy. The Receive connectors for Ex2010 have the FQDN as the local AD domain name (in my case mydomainame.lcl) and it's not possible to alter this to the external domain name (mydomain.com).
So my question is, how to I change the FQDN in the HELO on my Ex2010 server that is received by other mail servers trying to make a connection to my server?

Hope that explains it better.
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LVL 12

Expert Comment

ID: 35453481
did you try to do telnet to port 25 from command prompt,
if yes and the connection is closed after that, maybe it is because POP3 is a feature that can be set to every mailbox,

Expert Comment

ID: 35453488
This doesn't have anything to do with POP3. This has to do with setting up a reverse DNS pointer record in Exchange 2010 and the response that is sent to other mail servers when they issue an HELO command.
LVL 23

Accepted Solution

Suliman Abu Kharroub earned 2000 total points
ID: 35454397
from organisation configuration, hub transport -->"send  connector" properties -->change FQDN.


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