Exchange SMTP DNS quandry (no outgoing mail)

Exchange 2000 Server, SP3 on Windows 2000 server DC

Starting sometime last Saturday (Apr 3), my exchange server will not send any outgoing mail. The queue just continues to fill up. It receives mail just fine, and internal mail works too. I have not made any manual changes to any of the settings. It has been working happily for over three years. I have needed to move exchange off of my DC for a while now. I set up another machine and installed exchange on it. That was on Tuesday. I didn't complete the installation. Was intending to come back to it this week.

I have been sending mail with the virtual SMTP server since my ISP provides connectivity only. It has, as I've already stated, been working just fine. I can telnet to the SMTP server and send mail manually. The IP addresses for the external DNS servers for the SMTP server are correct. I can ping and perform nslookups on those DNS servers. IPconfig confirms that my machine will route to those DNS servers. I can resolve (ping) Internet address names happily.

I have performed the Microsoft magic reboot. I have restarted all exchange services, dns services, smtp services. I played with the order that I have restarted services.

What am I missing?
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dm_osbornAsked:
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dm_osbornConnect With a Mentor Author Commented:
Thanks Vahik. Unfortunately the Knowledgebase article doesn't apply here. The Virt SMTP server was working for incoming.

Good news though! It's working now! It was a temp fix followed by the (hopefully) permanent fix. The temp was to point a connector to an external SMTP relay that a friend let me use. I contacted my ISP and got the addresses for a different pair of DNS servers. Now the mail flows just fine without the relay connector. I'm a little confused, because I was still able to surf the Net with my gateway pointing to the old DNS servers and could perform nslookups. I guess I have some more to learn about DNS . . . lots more, I'm sure.
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VahikCommented:
http://support.microsoft.com/default.aspx?scid=kb;en-us;290290
first check to see if ur smtp server is healthy.Then make sure u dont have
any external dns server entery in ur default smtp servers configuration.
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