REST API - Sending email response to incident

Content

Hi,

I'm exploring the Rest API for some incident management. I can do a lot of the basic adding/updating/deleting of different objects, but I'm stuck with a couple of the actions around incident threads. Basically, I want to add a new thread/message as a response to an incident and have that send an email to the customer. I can add the message to the incident, but I can't work out how to trigger the email. In the web portal there is an option called "Send on Save" that triggers the email, but I can't find an equivalent flag in the API call.