Actually, I personalized the email a bit, which is why I need @user.  This template generates two separate kinds of email, as follows:

(1) If you register, the email says, "Welcome to MyFLix, Kevin Wang! We know that you'll enjoy the nation's premiere DVD and Blu-ray rental service. Enjoy!"

(2) If you receive the email because I have invited you to join, the email says, "Welcome to MyFLix, Kevin Wang! We know that you'll enjoy the nation's premiere DVD and Blu-ray rental service just as much as Joe Levinger. Enjoy!"