split DNS exchange

Our Company  has a new sbs 2003 , Not installed yet, small business with 17 nodes

  . I will be using split DNS configration.

 Is this going to cause me problems with exchange?
 as I want "exchange server" to connect to our ISP's email server to retrieve external email and to forward it to internal users (who will have the same email address internally as well as on the internet) internal users to forward email to exchange and then exchange forward it internet email servers.....newbie to mail servers.... Is this possible???

Thanks

Gkilmartin

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