$mail = new PHPMailer(); // create a new object
$mail->IsSMTP(); // enable SMTP
$mail->SMTPDebug = 1; // debugging: 1 = errors and messages, 2 = messages only
$mail->SMTPAuth = true; // authentication enabled
$mail->SMTPSecure = 'ssl'; // secure transfer enabled REQUIRED for GMail
$mail->Host = "smtp.domain.com";
$mail->Port = 587; // or 587
$mail->IsHTML(true);
$mail->SetLanguage("tr", "phpmailer/language");
$mail->CharSet ="utf-8";

$mail->Username = "rezervasyon@domain.com"; // Mail adresi
$mail->Password = "xxxxx"; // Parola

bu şekilde SMTP ayarlarını yaptım ancak halen "PHP Warning: mail() has been disabled for security reasons " bu hatayı alıyorum