/**
  * Determines if the email address is a shredder email address.  Shredder
  * email address delete all received emails without forwarding them or 
  * making them available for a user to check.
  *
  * @param $p_email  The email address to check.
  * @returns true: shredded disposable email, false: otherwise.
  */
 public static function is_shredder_email($p_email)
 {
     $t_domain = DisposableEmailChecker::_get_domain_from_address($p_email);
     if (DisposableEmailChecker::$shredder_domains_array === null) {
         DisposableEmailChecker::$shredder_domains_array = DisposableEmailChecker::_load_file('shredder_domains');
     }
     return in_array($t_domain, DisposableEmailChecker::$shredder_domains_array);
 }