[SMTP Mail Function]

I am trying to integrate php mail script on my website Logon Utility but getting error such as : 

 

 <?php
require_once "recaptchalib.php";

// your secret key
$secret = "xxxxxxxxxxxxxx";
 
// empty response
$response = null;
 
// check secret key
$reCaptcha = new ReCaptcha($secret);

if ($_POST["g-recaptcha-response"]) {
    $response = $reCaptcha->verifyResponse(
        $_SERVER["REMOTE_ADDR"],
        $_POST["g-recaptcha-response"]
    );
}

if ($response != null && $response->success) {
require_once "Mail.php";

$pcount=0;
$gcount=0;
 $file="";
    
 $from=$_POST['email'];
    
 $from2='info@yourdomain.com';
 $name=$_REQUEST['name'];

 $from = "".$name." <".$_POST['email'].">";

 $to = "info@yourdomain.com";

 $subject = "Mail from Logon Utility";

while (list($key,$val)=each($_POST))
        {
        if($key!='submit' && $key!='g-recaptcha-response')
        {
        $pstr = $pstr."$key : $val \n ";
        ++$pcount;
        }
        }
        while (list($key,$val)=each($_GET))
        {
        if($key!='submit' && $key!='g-recaptcha-response')
        {
        $gstr = $gstr."$key : $val \n ";
        ++$gcount;
        }
        }

 if ($pcount > $gcount)
        {
        $message_body=$pstr;

        }
else
        {
        $message_body=$gstr;

        }

 
 
$host = "ssl://secure.emailsrvr.com";
 $port = "465";
 $username = "info@yourdomain.com";
 $password = "xxxxxxx";    
 
 $headers = array ('From' => $from,
   'To' => $to,
   'Subject' => $subject);

 $headers2 = array ('From' =>$from2 ,
   'To' => $from,
   'Subject' => $subject);

 $smtp = Mail::factory('smtp',
   array ('host' => $host,
     'port' => $port,
     'auth' => true,
     'username' => $username,
     'password' => $password));
 
 $mail = $smtp->send($to, $headers, $message_body);
 
 if (PEAR::isError($mail)) {
   echo("<p>" . $mail->getMessage() . "</p>");
  } else {
   //echo("<p>Message successfully sent!</p>");
      header( "Location: thankyou.html"); 
  }
}
else {
    if(isset($_SERVER['HTTP_REFERER'])) {
    $ref= $_SERVER['HTTP_REFERER'];
}
    header("Location: ".$ref.""); 
  }

        
        ?>