mail question in PHP

Below is the simple mail code. I want to exclude $bizid in the $message from the email to user1@xxx.com, but I need to include $bizid for user2@zzz.com and user3@zzz.com in the BCC section. How can I go about it?

<?php

      require_once('includes/connection.php');

      $name = $_POST['fullname'];
      $bizid = $_POST['bizid'];
      $company = $_POST['company'];
      $email = $_POST['email'];
      $mobile = $_POST['mobile'];
      $enquiry = $_POST['about'];

      mysql_select_db($database_DBConn, $DBConn);
      $query_mysql = "SELECT * FROM company WHERE bizid = '$bizid'";

      $mysql = mysql_query($query_mysql , $DBConn) or die(mysql_error());
      $row_mysql = mysql_fetch_assoc($mysql );
      $totalRows_mysql = mysql_num_rows($mysql );
      
      if($row_mysql['email'] == ''){
      $toto = $email;
      }else{
      $toto =      $row_mysql['email'];
      }
      $subject = 'Enquiry - '.$company;
      $message = 'Hi,'."\r\n\r\n".'Welcome:'."\r\n\r\n".'Your Info:'."\r\n".'Business ID: '.$bizid."\r\n".'Company: '.$company."\r\n".'Email: '.$email."\r\n".'Mobile: '.$mobile."\r\n\r\n".'Your enquiry:'."\r\n".$enquiry;
      $headers = 'From: user1@xxx.com' . "\r\n" .
      $headers .= "Reply-To: user1@xxx.com\r\n";
      $headers .= "Return-Path: user1@xxx.com\r\n";
      $headers .= "CC: \r\n";
      $headers .= "BCC: user2@zzz.com, user3@zzz.com\r\n";
    'Reply-To: user1@xxx.com' . "\r\n" .
    'X-Mailer: PHP/' . phpversion();

      mail($toto, $subject, $message, $headers);

mysql_free_result($mysql);
//And close the connection
mysql_close($DBConn);


?>