Sending Out SPAM! NEED HELP! PLEASE CHECK

THIS SCRIPT IS SEND SPAMS... CAN ANY ONE TELL ME HOW TO SOLVE THIS ?

$mailer = new PHPMailer();
$mailer->IsSMTP();
$mailer->Host = 'ssl://smtp.gmail.com:465';
$mailer->SMTPAuth = TRUE;
$mailer->Username = 'xxxxxx@googlemail.com';  // Change this to your gmail adress
$mailer->Password = 'xxxxxx';  // Change this to your gmail password
$mailer->From = "$_POST['fromemail']";  // This HAVE TO be your gmail adress
$mailer->FromName = "$_POST['name']"; // This is the from name in the email, you can put anything you like here
$mailer->AddReplyTo("$_POST['fromemail']");
$mailer->Body = "$_POST['msg']";
//$mailer->IsHTML(true); // send as HTML
$mailer->Subject = "$_POST['subject']";
$mailer->AddAddress($invite_email);  // This is where you put the email adress of the person you want to mail
if(!$mailer->Send())
{
   echo "<br>Message was not sent<br/ >";
   echo "Mailer Error: " . $mailer->ErrorInfo;
}
else
{
   echo "Message has been sent";
}

PHP:

 

what do you mean by sends spam?

 

I just need help in this script as this is a SMTP mailing script, which is not working properly... and sending mails as SPAM