add_filter( 'auto_core_update_send_email', 'wpb_stop_auto_update_emails', 10, 4 ); function wpb_stop_update_emails( $send, $type, $core_update, $result ) { if ( ! empty( $type ) && $type == 'success' ) { return false; } return true; } add_filter( 'auto_plugin_update_send_email', '__return_false' );