Open a specifc URL in Fluid.app

I use Fluid.app for particular websites, such as a bug tracker, or a Wiki. However, when I receive notifications in an e-mail with that URL and click on it, I'll get the page opened in the default browser. Is there a way to open a website in the Fluid.app instead? P.S.: I have looked at RCDefaultApp, but could not find a way to do this.