Help me please! When sending email messages php script in the browser worked through about 2 minutes, but all messages are delivered.
there are no errors on other SMTP servers is the same

PHP code

date_default_timezone_set('Europe/Kiev');
require_once($_SERVER['DOCUMENT_ROOT'].'/engine/phpmailer/PHPMailerAutoload.php');


$mail = new PHPMailer;

$mail->isSMTP();
//хост
$mail->Host = 'smtp.mail.ru';

$mail->SMTPAuth = true;

$mail->Username = 'admin@example.com';

$mail->Password = '********';

$mail->SMTPSecure = 'ssl';

$mail->Port = '465';
 $mail->debug = true;

$mail->CharSet = 'UTF-8';

$mail->From = 'admin@example.com';
$mail->FromName = 'Админ';
$mail->addAddress('mail@example.com');

$mail->isHTML(true);

$mail->Subject = 'Тест Темы письма';
$mail->Body = 'тестовый текс Текст можно с  хтмл';
if( $mail->send() ){
    echo 'Письмо отправлено';
}else{
    echo 'Письмо не может быть отправлено. ';
    echo 'Ошибка: ' . $mail->ErrorInfo;
}