In order to customize the Registration email and to have it working properly, the email template must have 4 things.
1. Title: the title of the email must be Website Registration Email
2. [WebsiteUsernameAndPassword] - Will be replaced with the login information (username & password) for the website user.
3. [WebsiteShortValidationLink] - Will be replaced with a short validation link (works in email browsers that support HTML).
4. [WebsiteLongValidationLink] - Will be replaced with a long validation link (works in text-only email browsers).
NOTE: If you are missing any one of these 3, the registration email will not work properly.