The 'SLA email message' is a system setting that allows you to craft, edit, and save template emails for whenever an SLA is breached. These can be fully edited using our tagging system to automatically fill in the requisite information.
Under the 'Contracts' section of system settings, you can click into 'SLA email message' to craft your templates:
You can drag and drop these templates in order to reorder them to best suit your needs.