I have one DNS/AD 2003 server and an Exchange 2003server. The DNS server is domainname.int but my true public DNS is domainname.org , used for e-mails. The echange server was made on and is joined todomainname.int, and my question is how do I now setup my emails to be domainname.org and not .int. Is there a setting in Echange ro resolve this or is this a DNS issue? Any suggestions would be greatly welcome.

Primarily, it's an Exchange setting.You need to modify the default recipient policy to allow @domainname.org to be configured on your server.http://technet.microsoft.com/en-us/library/aa996060.aspx. in addition to this, ensure that external mx records and port 25 is mapped accordingly. reply if you need additional assistance with these 3 topics