Cannot send to external addresse, but can receive external & send & receive internal

We replaced our primary DC running Server 2003 and the following error popped up on our existing Exchange Server 2003.  

Users can send and receive to any internal address.  They can also RECEIVE mail from external addresses.  However,  no one to SEND e-mail to EXTERNAL addresses.  Any suggestions.

Everything has been working fine for 2+ years until we replaced our Primary DC.  Thanks.
rjwcpaAsked:
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debuggerauConnect With a Mentor Commented:
Good, so your testing the SMTP by telneting to port 25 on various servers...
This should tell you that unless you connect and get a HELO response, chances are it wont connect.
So just check the windows firewall firstly, are you using the DC for DNS lookups?
Are you trying to connect with domain name or IP address?

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debuggerauCommented:
was the old primary DC also your cached DNS server for exchange?

Or was the DNS forwarder in exchange, using the DC for resolution?

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rjwcpaAuthor Commented:
Yes the old DC was the only DNS server.  I removed and reinstalled the DNS service on the DC because I could not connect to the internet, but after the reinstall and adding forwarders DNS is working.
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rjwcpaAuthor Commented:
I have not changed any settings on my Exchange Server prior to and after the replacement of the DC.
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debuggerauCommented:
have you tried to nslookup an address from the exchange server?
If it cant see the outside 'DNS' world, it will never resolve to send.

So maybe your new DNS server is a root server itself and not forwarding properly?
Is the firewall blocking port 53?
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rjwcpaAuthor Commented:
The firewall configuration has not changed, and it worked fine before the introduction of the new DC.

I can connect to webpages on the EXchange server and can telnet to my ISP local mail server to send test e-mail.  However, I cannot telnet to any other mail server.
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rjwcpaAuthor Commented:
Yes I am using the DC as the DNS.  And I am using domain names.  The only domain name I can connect to on port 25 is mail.alltel.net (MY ISP mail server).
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debuggerauCommented:
And what about telnet to the ip address of a known email server?
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