Freemarker Data Model for Email Templates
Customizing Crucible email templates with Freemarker
See the Freemarker documentation for instructions on Freemarker syntax. Use the templates that ship with Crucible as a guide to the properties available on each object.
Specific email types will have extra data associated with them, and this data will be available in that particular template (but not in others).
The syntax to access the data-model, using the data model object 'link' as an example, place this code into the email at the desired position.