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post registration redirect
For spotmouth, the user management is in Drupal. When a user registers, they are by default redirected to the Drupal front page. For spotmouth, this automatically redirects the user to the grails portion of the app, so a) user does not see the "check email" message that drupal provides.
What I wanted to do was direct the users when they register to a thank you page. This was easy, I just created my "thank you" page in the CMS and installed the "Rules" modules.
I created a new rule for when users are created, and did a page redirect to my Thank you page.
Mission accomplished.