valid_email RFC specification FAIL!!! [SOLVED]

Code:
/**

    * Valid Email

    *

    * @access   public

    * @param    string

    * @return   bool

    *

    * Original author:  Sandeep V. Tamhankar ([email protected])

    * changes by Craig Cockburn to accommodate top level domains .museum and .name

    * PHP translations by Chalda Pnuzig http://blog.chalda.it/?p=11

    */

   function valid_email($str)

   {

      $emailPat = '/^(.+)@(.+)$/';

      $specialChars = '\\(\\)<>@,;:\\\\\\\"\\.\\[\\]';

      $validChars = '[^\\s' . $specialChars . ']';

      $quotedUser = '("[^"]*")';

      $ipDomainPat = '/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/';

      $atom = $validChars . '+';

      $word = '(' . $atom . '|' . $quotedUser . ')';

      $userPat = '/^' . $word . '(\\.' . $word . ')*$/';

      $domainPat = '/^' . $atom . '(\\.' . $atom . ')*$/';



      if (! preg_match($emailPat, $str, $matchArray)) {

         $this->set_message('valid_email', 'Email address seems incorrect (check @ and .\'s)');

         return false;

      }



      $user = $matchArray[1];

      $domain = $matchArray[2];



      if (! preg_match($userPat, $user)) {

         $this->set_message('valid_email', 'The part of your email address before the \'@\' doesn\'t seem to be valid.');

         return false;

      }

      if (preg_match($ipDomainPat, $domain, $IPArray)){

         for ($i = 1; $i <= 4; $i++) {

            if ($IPArray[$i] > 255) {

               $this->set_message('valid_email', 'Destination IP address is invalid!');

               return false;

            }

         }

         return true;

      }



      if (! preg_match($domainPat, $domain, $domainArray)){

         $this->set_message('valid_email', 'Part of your email address after the \'@\' doesn\'t seem to be valid');

         return false;

      }



      $atomPat = '/'.$atom.'/';



      if (preg_match_all($atomPat,$domain, $domArr)){

         $domArr = $domArr[0];

         $len = count($domArr);

         $firstDoaminLevel = strlen($domArr[$len - 1]);

         if ( ( $firstDoaminLevel < 2) || ($firstDoaminLevel > 6) ) {

             $this->set_message('valid_email', 'The address must end in a top level domain (e.g. .com), or two letter country.');

             return false;

         }

         if ($len < 2) {

            $this->set_message('valid_email', 'This address is missing a hostname!');

            return false;

         }

      }

      return true;

   }