Go into Excange System Manager, expand servers, your server, protocols, SMTP, defauly smtp virtual server, right click, properites, delivery, advanced, Smart Host.
You can put in a dns host name, or an IP but if its an IP it must be enclosed in these brackets [ ]
So for example if your isp's mail server is 192.168.1.1 you would but the IP as this [192.168.1.1] otherwise you can type the dns name without the brackets.
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