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Exchange 2010 Receive Connector FQDN

I'm setting up Exchange 2010 for my organization.  Clean install, no other exchange servers in the organization.  When you telnet into port 25 the internal server name is displayed.  I realize you change this in the "Default <Server Name>" properties.  But the system won't let me, it has to match the FQDN of the transport server; which i believe is the FQDN of the server itself.

Server is running the typical CAS, HT and Mailbox roles.

So how do I do this?  I obviously don't want to broadcast to the world my internal information.

Also, in the message options of e-mails it also shows the internal IP of the server.  How do I correct this too?
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Sommerblink
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In EMC,

Go to Server Configuration / Hub Transport / Receive Connector and right-click on your SMTP connector, choose Properties.

Then under "Specify the FQDN this connector will provide in reponse to HELO or EHLO:"
Type in the FQDN for your external IP address.

In some cases, the server listed her MUST match the PTR record for your external IP address.
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ASKER

Yes and as my OP stated I get an error when changing this.  See the attached image.    
FQDN-Error.jpg
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Ok, so when I do this is complains about over lapping IP range/port with the Default Connector.  So this is what I did, please let me know if this is the best practice.

1) Moved Default to port 50 (Don't like deleting stuff at first)
2) Setup an Anonymous connector, allowing just anonymous connections
3) Setup an Exchange Servers connector, allowing Exchange servers Auth. on just my internal IP scheme.

Does this sound correct?
It sounds OK.

Question, are you able to send/receive email on the internet and also have your outlook clients connect to exchange?
I haven't tried having outlook client connect, but based on the configurations of the different receivers, it should work.  I do have another receiver that is just for the clients.
Ah... Why do I have to supply an reason?  It was answered, hence why I am awarding points.