Description:
------------
Dear, 
In our Website we have an option to send an e-mail..where I'am using the send_email function to send via SMTP.
the function was working correctly and e-mails were sent, but today when trying to send an e-mail, it gives me: 'error: send e-mail failed.
SMTP is up and running.  (we re-start it and we re-start the IIS server but nothing change)
please I need help to know why mail are not sent.
(here is the function)
thank you,

Sincerely,

Reproduce code:
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    function send_email($to, $subject, $message, $from, $name)
    {
    	require("includes/class.phpmailer.php");

	    $mail = new PHPMailer();

	    $mail->IsSMTP();  // send via SMTP
	    $mail->Host     = "localhost"; // SMTP servers
	    $mail->SMTPAuth = false;     // turn on SMTP authentication

	    $mail->From     = $from;
	    $mail->FromName = $name;
	    $mail->AddAddress($to);// optional name
	    $mail->AddReplyTo($to,"");

	    $mail->WordWrap = 50;  // set word wrap
	    $mail->IsHTML(true);   // send as HTML

	    $mail->Subject  =  $subject;
	    $mail->Body     =  $message;
        $mail->AltBody     =  $message;

	    if(!$mail->Send())
	    {
            
	        print"<script>
            	alert('error: send e-mail failed');
                window.close()
	    	    </script>";
	       echo "Mailer Error: " . $mail->ErrorInfo;
	    }
        else
		{
            
	        print"<script>
            	alert('e-mail sent successfully');
                window.close()
	            </script>";
        }
    }