private function __construct() {

		// Template functions.
		llms()->include_template_functions();

		// Email base class.
		$this->emails['generic'] = 'LLMS_Email';

		// Email child classes.
		$this->emails['engagement']     = 'LLMS_Email_Engagement';
		$this->emails['reset_password'] = 'LLMS_Email_Reset_Password';

		$this->emails = apply_filters( 'lifterlms_email_classes', $this->emails );
	}