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Customising the Confluence email templates is not supported. If you do decide to edit the templates we strongly recommend you use a test instance of Confluence.
Any customisations you make to the Confluence email notification templates will need to be reapplied after upgrading Confluence.
Email notification templates are contained within the confluence-email-notifications plugin, which is a bundled plugin (add-on) that is installed automatically when you install Confluence.
Only administrators with access to the Confluence installation directory can modify the Confluence email templates.
Confluence uses Soy templates (also known as Closure templates) for email notifications. You can find out more in the Google Developer docs or see our developer tutorial which contains a short introduction to using Soy templates.
To change the email notification templates:
/confluence/WEB-INF/atlassian-bundled-plugins/confluence-email-notifications-plugin-x.x.jar /templates/ folder. Edit the Soy templates to make your changes. /confluence/WEB-INF/atlassian-bundled-plugins folder (replacing the original file - you might want to make a copy of the original file for easy roll back) and then restart your instance. We strongly recommend you use a test instance for editing the templates contained within the plugin. If you are unable to enable the plugin, check the Confluence logs for information, it may be that there are problems with your edits to the Soy templates.