来自Root User的PHPMailer更改会产生错误

Question

我尝试在PHP邮件程序中更改来自Root用户

 require 'mailer/PHPMailerAutoload.php';

      $mail = new PHPMailer(true);
      $mail->isSMTP();                                      
      $mail->Host = 'localhost';  
      $mail->SMTPAuth = true;                              
      $mail->Username = '';                
      $mail->Password = '';                           
      $mail->SMTPSecure = 'tls';                          
      $mail->Port = 25;                                  



     try{ $mail->addAddress('user@gmail.com', 'Poweronups');

      $mail->addReplyTo($_POST['email'], 'Information');
       $mail->SetFrom('info@user.com', 'user');
      $mail->isHTML(false);                                 
      $mail->Subject = 'Poweron Contact Details';
      $mail->Body    = "Name : ".$_POST['full_name']. "\r\n" .
            "Email : ".$_POST['email']. "\r\n" .
            "Website : ".$_POST['website']. "\r\n" .
            "Message : ".$_POST['message'];

      if(!$mail->send()) {
          $_SESSION['contact_alert'] = 'Message could not be sent.';
          $_SESSION['contact_alert'] = 'Mailer Error: ' . $mail->ErrorInfo;

      } else {
         $_SESSION['contact_alert'] = 'Thank you !'. "\r\n" .

             'Your message has been successfully sent . We will contact you very soon !';
           $mail->addAddress($_POST['email'], 'user');    
          $mail->addReplyTo('info@user.com', 'Information');
          $mail->isHTML(false);                                 
          $mail->Subject = 'Poweron Contact Details';
          $mail->Body    = "Hai ".$_POST['full_name'].". Your Contact Details Has Been Sent Successfully.The Contact Team Will Get Back To You ASAP.";
          $mail->send();
      }
    } catch (phpmailerException $e) {
 echo $e->getMessage();

在这种情况下，当我添加$ mail-＆gt; SetFrom（'info @ user.com'，'Poweronups'）; 并尝试发送邮件页面转到空白页面。没有这个它将完美地工作。但它显示root用户。