@LordMayros; mail fonksiyonu hosting firmalarında kapalıdır, bu sebepten dolayı smtp ile mail göndermeniz gerekiyor. Ayrıca xxx yazdığınız kısımlar ise kodda comment durumunda yani pasif, başlarındaki // ı silerek aktif edebilirsiniz.

örnek:

<?php
/*
Name:             Contact Form
Written by:     Okler Themes - (http://www.okler.net)
Version:         4.9.2
*/
 
session_cache_limiter('nocache');
header('Expires: ' . gmdate('r', 0));
 
header('Content-type: application/json');
 
require_once('php-mailer/PHPMailerAutoload.php');
 
// Step 1 - Enter your email address below.
$email = 'you@domain.com';
 
// If the e-mail is not working, change the debug option to 2 | $debug = 2;
$debug = 0;
 
$subject = $_POST['subject'];
 
$fields = array(
    0 => array(
        'text' => 'Name',
        'val' => $_POST['name']
    ),
    1 => array(
        'text' => 'Email address',
        'val' => $_POST['email']
    ),
    2 => array(
        'text' => 'Message',
        'val' => $_POST['message']
    )
);
 
$message = '';
 
foreach($fields as $field) {
    $message .= $field['text'].": " . htmlspecialchars($field['val'], ENT_QUOTES) . "<br>\n";
}
 
$mail = new PHPMailer(true);
 
try {
 
    $mail->SMTPDebug = $debug;                                 // Debug Mode
 
    // Step 2 (Optional) - If you don't receive the email, try to configure the parameters below:
 
    $mail->IsSMTP();                                         // Set mailer to use SMTP
    $mail->Host = 'xxxxxxxxxxxx';                       // Specify main and backup server
    $mail->SMTPAuth = true;                                  // Enable SMTP authentication
    $mail->Username = 'xxxxxxxxx';                    // SMTP username
    $mail->Password = 'xxxxxx';                              // SMTP password
    $mail->SMTPSecure = 'tls';                               // Enable encryption, 'ssl' also accepted
    $mail->Port = 587;                                          // TCP port to connect to
 
    $mail->AddAddress($email);                                    // Add another recipient
 
    $mail->AddAddress('xxxxxxxxxx', 'noreply');     // Add a secondary recipient
    //$mail->AddCC('person3@domain.com', 'Person 3');          // Add a "Cc" address.
    //$mail->AddBCC('person4@domain.com', 'Person 4');         // Add a "Bcc" address.
 
    $mail->SetFrom($email, $_POST['name']);
    $mail->AddReplyTo($_POST['email'], $_POST['name']);
 
    $mail->IsHTML(true);                                  // Set email format to HTML
 
    $mail->CharSet = 'UTF-8';
 
    $mail->Subject = $subject;
    $mail->Body    = $message;
 
    $mail->Send();
    $arrResult = array ('response'=>'success');
 
} catch (phpmailerException $e) {
    $arrResult = array ('response'=>'error','errorMessage'=>$e->errorMessage());
} catch (Exception $e) {
    $arrResult = array ('response'=>'error','errorMessage'=>$e->getMessage());
}
 
if ($debug == 0) {
    echo json_encode($arrResult);
}