How do I stop other domains from pointing to my domain?

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I recently found out that there are other domain names pointing to my website (that don't belong to me) and I was wondering how people can stop/prevent this from happening. I'm hosting this on peer1 using IIS and I'm using ASP.NET C#.

Can I use an HttpModule or some other code to reject domain names that aren't mine?

Is there a better way?

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