public static function validEmail($email) {
			// enforce maximum length to prevent libpcre recursion crash bug #52929 in PHP
			// fixed in PHP 5.3.4; length restriction per SMTP RFC 2821
		if (strlen($email) > 320) {
			return FALSE;
		}
		require_once(PATH_typo3 . 'contrib/idna/idna_convert.class.php');
		$IDN = new idna_convert(array('idn_version' => 2008));

		return (filter_var($IDN->encode($email), FILTER_VALIDATE_EMAIL) !== FALSE);
	}