Administration Guide
E-mail Fields
The E-mail Fields category provides a list of e-mail related fields of the object involved in the workflow operation. This category is only available when specifying recipient addresses for E-mail Notifications.
Like other placeholders for object fields, placeholders for e-mail fields have the DBF prefix. For example:
%[DBF Assignee_ID.Primary_Email]%
INFO: For details, see Creating E-mail Notifications.