The Email Manager addon provides filters that let you customize email templates and adjust the available settings within the email manager interface. Use these hooks to modify default subjects, add new configuration fields, or override existing ones.
Filters
stm_lms_email_manager_emails
Type: filter
What it does: lets you change the default email templates and their values (for example, subject lines or message bodies)
Parameters:
$emails (array) list of email templates and their data