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Internal vs External DNS of Exchange

how to check which Internal and External DNS pointing to my  Exchange server 2003.
2 Solutions
I dont know if I understood your question really well "What DNS pointing TO my exchange 2003"
Is your exchange server also a DNS server ? Is it a DC ? Is the DNS server on Exchange reachable from Internet ? Or do you want to know which DNS exchange is using to deliver mails ?

Anyway if you want some clarification about how your server is using DNS servers for resolving AD objects and sending mails, here is how it goes :

Windows server will use Network local area connexion DNS to resolve names in Domain. Forwareded requests to other domains (ie. Internet) are made by the DNS Server forwarders, which is a DC in most cases. Exchange will use this DNS if no external are explicitely set.

Exchange server 2003 can also send mails from its default SMTP connector using external DNS (Administrative group -> server -> protocol ->SMTP. Properties -> Delivery -> Advanced - > Configure DNS)
With these DNS set, Exchange will resolve names and find domains MX using them rather than Windows' default DNS.

Connectors : Are used to choose delivery policy, mostly used to select a smarthost to transfer the mails to. This smarthost will resolve domain names using its configured DNS.

You can use NSLOOKUP and webpage tools to verify external records and nslookup can do the same internally

to use nslookup you can point it at a public external DNS server "server servename"

if you want to check just mx records - use set type=mx and then input the domain name you are running from your exchange server

If you google nslookup you can find web sites that host those tools to show records for a domain
kloth.net is one of the popular ones

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