WP Maintenance Mode contact form 7 (or any form)

My contact unit tag is : wpcf7-f125-t1-o1
Contact form 7 works if i modify this lines (i think wp maintenance mode settings should include a list of POST variables authorized) :

if ( ( !$this->check_role() )
					&& !strstr($_SERVER['PHP_SELF'], 'wp-login.php' )
					&& !strstr($_SERVER['PHP_SELF'], 'async-upload.php')
					&& !strstr($_SERVER['PHP_SELF'], '/plugins/')
					&& !$this->check_exclude()
				 ) {
				$rolestatus = 'norights';
				nocache_headers();
				if (($_SERVER["REQUEST_METHOD"]!='POST') or ($_POST["_wpcf7_unit_tag"]!="wpcf7-f125-t1-o1")) {
					header("HTTP/1.0 503 Service Unavailable");
					header("Retry-After: $backtime");
					include('site.php');
					exit();
				} else return;
			}

http://wordpress.org/extend/plugins/wp-maintenance-mode/