Hi Colin,

The way I would do this would basically involve two steps:

1 - Either yourself directly via IIS or via the hosting company's control panel or even with the help of you hosting provider support, you need to make these 3 domains pointing to the same site instance. I cannot really go deeper here as I'm not sure about your situation;

2 - Now in DNN you have to login as superuser, go to Admin/Site Settings/Portal Alias/ and "Add new Alias" for the additional domains you want to point to that site. So lets say that you have DNN setup on www.MySite1.com - Then:
2.1 - You log to www.MySite1.com as superuser
2.2 - go to Admin/Site Settings/Portal Alias/
2.3 - Add www.MySite2.com and www.MySite3.com as new Alias. You may want to add without WWW as well like MySite2.com and MySite3.com

Just keep in mind that following my instruction will only work if you do both #1 and #2 above.

There might be another way or a better way, but I know that this approach will work.

Best regards,
-Aderson

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Aderson Oliveira
Your DNN Wingman
DeskPal.com

Thanks all, One other question how does this method affect google analytics and ranking. I am thinking of the 301 redirect issues on SOE rankings. Regards Colin