How do I create new Message Templates? I am using Drupal 6 with the Open Atrium distribution, as for now I am able to send email notifications every time I post or edit a news. However I'd like to create more message templates, specifically I'd like to use a different template based on the news tags. For instance if I publish a news with "gallery" tag I want to use a dedicated template and so on. Any idea on how I can accomplish that? Many thanks.
Previewable email templates is a good module and supports Rules and Tokens.


  The Previewable Email Template (PET) module lets you create email
  templates, with token substitution, which can be previewed by the user
  before sending. The emails can be sent to one or many email addresses
  in a flexible way, and the recipients may or may not be Drupal account
  holders (users).