If you are just going to be setting it up for SMTP relaying, it isn't very difficult. You don't have to "move" it to the Internet. All you have to do is tell your firewall to pass SMTP connections to the Domino server. Same goes for outbound. Now, if you want to have DWA (iNotes) available, that requires some more configuration that we won't get into today. However, if all you need is to send and receive Internet mail, look at this link.
It is an excellent article (very similar to one I wrote 18 months ago, but updated for 6.5.x) that goes over everything you need to set up and secure your Domino server for SMTP purposes
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This was first published in October 2004