Hi, as title, how can I default an email template when click 'Reply' or 'Reply All' button on Case Feed item? Basically I would like to load a simple reply signature template when users click on  'Reply' or 'Reply All' button on Case Feed email feed item.

 I understand that the Smart Templates (Enable Default Email Templates) feature allows you to drive which template is pre-loaded from any apex logic you create, but that is for when you typing a new email. I would like to load a template when click on 'Reply' or 'Reply All' button and my template will be the top of the message and follow by my 'original message'

Is that possible?