public static function isEmailValid($postedParam) 
	{
		$isEmailEmpty = true;	
		$isValidEmail  = false;

		if(isset($postedParam['email'])) {

			$isEmailEmpty = CheckoutApi_Lib_Validator::isEmpty($postedParam['email']);

		}

		if(!$isEmailEmpty) {

			$isValidEmail =  CheckoutApi_Lib_Validator::isValidEmail($postedParam['email']);

		}

		return !$isEmailEmpty && $isValidEmail;

	}