When I create a new message where I leave out the fields Subject, FromEmail, FromName, the values which I have set in Mandrill (https://mandrillapp.com/templates) are ignored.
Go snippet:
message := gochimp.Message{ Html: renderedTemplate, To: recipients, TrackClicks: true, TrackOpens: true, }
Mandrill template configuration:

My assumption is that gochimp is still sending an empty string via the Mandrill API. Omitting the field when it is not set might honor the predefined values in Mandrill.
When I create a new message where I leave out the fields
Subject, FromEmail, FromName, the values which I have set in Mandrill (https://mandrillapp.com/templates) are ignored.Go snippet:
message := gochimp.Message{ Html: renderedTemplate, To: recipients, TrackClicks: true, TrackOpens: true, }Mandrill template configuration:

My assumption is that gochimp is still sending an empty string via the Mandrill API. Omitting the field when it is not set might honor the predefined values in Mandrill.