SabaiDirectory uses wp_mail function for emailing purposes. By default, it does not support HTML tags inside the templates. However, you can enable this feature by adding a filter.
Just add the below code in your theme functions.php file. But note that, once you add this feature, you need to edit all the Sabai Directory email templates. You need to add <br /> tag wherever you want to give new line.
add_filter( 'wp_mail_content_type', 'set_content_type' ); function set_content_type( $content_type ){ return 'text/html'; }