Set a Saved Message on the template level
Currently the subject of the email when a document is sent from a template is the name of the template and a message has to be written each time a document is sent via a template. I suggest that each template can have a custom default email subject and message that is filled into these areas and is able to be edited when sent but is auto filled to a the pre-set subject and message

Hi. We aren’t planning on building this into our feature set at this point in time since it doesn’t fit into our current product roadmap. Please keep upvoting this idea so we can keep considering it every time we work on our roadmap.
Should you come across any other ideas that suit your business needs, don’t hesitate to give them an upvote!
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Arvi Martinez commented
email message body to have templates