Invalid Connector Primary target IP address responded with 4.2.1 Unable to connect

When installing a new Microsoft Exchange Server 2007, I can send and receive mail internally just fine. However, when I attempt to send mail to the Internet, I receive the following error: "Invalid Connector Primary target IP address responded with 4.2.1 Unable to connect"
conner172Asked:
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hodgeyohnCommented:
what are your settings on the smtp connector?
check your dns settings.
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conner172Author Commented:
Thanks for the quick reply. Would you please explain your two questions? What settings specifically am I looking for on my SMTP connector? What settings specifically am I concerned with on my DNS server?
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hodgeyohnCommented:
are you setup to route mail via dns, or forward to a host
do an nslookup and try to resolve a few domains outside yours.
if you can resolve www.microsoft.com, then it can probably resolve thier mail information to.
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conner172Author Commented:
I see what you mean. Yes, the nslookup is working and I'm not using a separate host for e-mailing.
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conner172Author Commented:
The solution was that there was apparently an obscure setting in the firewall preventing the connection from occurring.
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