// Scheduled Action Hook function send_mail( ) { return wp_mail( '[email protected]', 'Notification TEST', 'TEST', null ); } add_action( 'send_mail', 'send_mail' ); // Schedule Cron Job Event function custom_cron_job() { if ( ! wp_next_scheduled( 'send_mail' ) ) { wp_schedule_event( current_time( 'timestamp' ), 'daily', 'send_mail' ); } } add_action( 'wp', 'custom_cron_job' );