"553 Relaying disallowed as Nischal Kumar <nischalhacks@gmail.com>

"553 Relaying disallowed as Nischal Kumar <nischalhacks@gmail.com>

Hi, 
I am using SMTP swift mailer for send mail by using php and by using smtp server. When I am trying to send mail i am getting 
xpected response code 250 but got code "553", with message "553 Relaying disallowed as Nischal Kumar <nischalhacks@gmail.com> "
 the above exception.

Code for sending mail is: 

$transport = Swift_SmtpTransport::newInstance('smtp.zoho.com', 465, 'ssl' )
 ->setUsername(' nischal@wizork.com')     
 ->setPassword('xxxxxxxxxxxxxxxxxxxx')
 ;

$mailer = Swift_Mailer::newInstance($transport);
// Creating the message text using fields sent through POST
foreach ($_POST as $key => $value)
$messageText .= ucfirst($key).": ".$value."\n\n";
// You can change "A message from Pivot Template Form" to your own subject if you want.
$message = Swift_Message::newInstance('A message from Pivot Template Form')
 ->setFrom(array($_POST['email'] => $_POST['name']))
 ->setTo(array(' nischal@wizork.com' => 'Mail Admin'))->setBody($messageText);
//                           ^                    ^
//       Your email address_/          Your name_/

 

// Send the message or catch an error if it occurs.
try{
echo($mailer->send($message));
}
catch(Exception $e){
echo($e->getMessage());
}
exit;
}