I was hoping to get more information on the purpose and intended usage of the following fields of a mail.template:

use_default_to

email_to

partner_to

How do these fields interact and how are they supposed to be used?

For each of my vendors, I have an address with the custom field "x_is_dropshipping_contact = True". I would like to use tell my email template to send to the email address listed in that address. Is this possible to do?