PHP “Wrong referrer” error when submitting a mail form

Wrong referrer (referring site). For security reasons the form can only be used, if the referring page is part of this website.

Note for the Admin: Please add the name of your server to the referrer variable in the index.php configuration file: mywebsite.com

$referring_server = 'http://www.mywebsite.com, scripts';

$referring_server = 'yourdomain.com';

$script_root           = './';

      $referring_server      = 'http://www.mywebsite.com, scripts';
      $allow_empty_referer   = 'yes';     // (yes, no)

      $language              = 'en';      // (see folder 'languages')

      $ip_banlist            = '';

      $ip_address_count      = '0';
      $ip_address_duration   = '48';

      $show_limit_errors     = 'yes';    // (yes, no)

      $log_messages          = 'no';     // (yes, no)

      $text_wrap             = '65';

      $show_error_messages   = 'yes';

      $attachment            = 'no';    // (yes, no)
      $attachment_files      = 'jpg, gif,png, zip, txt, pdf, doc, ppt, tif, bmp, mdb, xls, txt';
      $attachment_size       =  100000;

      $path['logfile']       = $script_root . 'logfile/logfile.txt';
      $path['upload']        = $script_root . 'upload/'; // chmod 777 upload
      $path['templates']     = $script_root . 'templates/';

      $file['default_html']  = 'form.tpl.html';
      $file['default_mail']  = 'mail.tpl.txt';

'txt_additional' => 'Additional', //  {txt_additional}
                          'txt_more'       => 'More'        //  {txt_more}

                        );