[Unista]

Hello i have problem because when i want to use this script i have error 500
My code

Код:

<?php 
if (isset($_GET['code']))//checks if request from SA:MP server contains code 
{ 
    $code = $_GET['code'];//Redefine just to look better :) 
    if($code == 44514)// Compare code from SA:MP request, a.k.a password to avoid spam or unauthorized requests 
    { 
        if (isset($_GET['msg']) && !empty($_GET['msg']))//Checks if request from SA:MP server contains messag you want to send 
        { 
            $message = $_GET['msg'];//Redefine just to look better :) 
            $message = str_replace("-"," ",$message);//Replace all - back to blank space as url cant contains blank spaces 
            mail("slonecznyots@gmail.com", "Email from server", $message,"From: \"SA:MP server\" <slonecznyots@gmail.com>\r\n" ."X-Mailer: PHP/" . phpversion());//Send an email, format: To,Subject,Message,From 
            echo "Email delivered";//Response message to SA:MP server, so server knows request was valid 
        } 
    } 
} 
?>

Help it is very important for me.

My site is imaginerp.xaa.pl