Question

How to populate "To", "From", and "Subject" into document definition automatically?

Answer

We can create a service field and go to Data Source to set it to the Batch registration parameter.  

To get the "subject", "from", and, "to" info we can use the following registration parameters.

• fc_Predefined:EmailSubject
  The subject of the e-mail message.
• fc_Predefined:EmailSender
  The sender's address.
• fc_Predefined:EmailAddressee
  The addresses of the recipients in the "To" field.

This way the fields in the document definition will be filled by the registration parameters.  

Additional Information

Registration Parameters