Exchange 2003 DNS Connection

I have an exchange 2003 box, roughly every hour I see 2 system events:
1. SMTP error connecting to DNS server, protocol used was UPD
2. SMTP error connecting to DNS server, server is either down or none are available.

Thoughts?
Rob TimmermansIT SpecialistAsked:
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rakeshmiglaniCommented:
have you configured external DNS servers in the properties of the smtp virtual server?
have you configured external DNS server's ip address in the tcp/ip properties of the exchagne server?
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Rob TimmermansIT SpecialistAuthor Commented:
No to both.
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poweruser32Commented:
is ther any errors showing on your dns server that exchange uses?
is your email delivery effected as well?
it looks like your dns server is giving some problems
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Rob TimmermansIT SpecialistAuthor Commented:
no email problems related to this error.  I am not seeing anything on the dns server.
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Rob TimmermansIT SpecialistAuthor Commented:
"The DNS server has encountered numerous run-time events. To determine the initial cause of these run-time events, examine the DNS server event log entries that precede this event. To prevent the DNS server from filling the event log too quickly, subsequent events with Event IDs higher than 3000 will be suppressed until events are no longer being generated at a high rate." This is what I am seeing under the dns event log.  Email is not affected by this problem.  
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Windows Server 2003

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