Ошибка почтовой программы PHP

Я пытался использовать php почтовую программу, но ошибки следующим образом.

SMTP -> FROM SERVER:
SMTP -> FROM SERVER:
SMTP -> ERROR: EHLO not accepted from server:
SMTP -> FROM SERVER:
SMTP -> ERROR: HELO not accepted from server:
SMTP -> ERROR: AUTH not accepted from server:
SMTP -> NOTICE: EOF caught while checking if connectedSMTP Error: Could not authenticate. Message could not be sent.

Mailer Error: SMTP Error: Could not authenticate. 

и мой код

 <?php
        require("class.phpmailer.php")
        $mail = new PHPMailer();        
        $mail->IsSMTP();                                    
        $mail->Host = "smtp.gmail.com";  
        $mail->Port = 465;        
        $mail->SMTPAuth = true;     

        $mail->SMTPDebug = 2;  
        $mail->Username = "admin@xxxxxxxxxxxx.in";  
        $mail->Password = "xxxxxxxx";   
        $mail->From = "admin@xxxxxxxxxxxx.in";
        $mail->FromName = "Mailer";
        $mail->AddAddress("xxxx@yahoo.co.in", "mine");               
        $mail->WordWrap = 50;                                 
        $mail->IsHTML(true);                                  

        $mail->Subject = "Here is the subject"  
        $mail->Body    = "This is the HTML message body <b>in bold!</b>";
        $mail->AltBody = "This is the body in plain text for non-HTML mail clients";


        if(!$mail->Send())  {
           echo "Message could not be sent. <p>";
           echo "Mailer Error: " . $mail->ErrorInfo;
           exit;
        }
        echo "Message has been sent";

        ?>