> I have no idea how blocking TLDs of entire countries with hundreds of millions of citizens can be considered a valid anti-spam advice. It is very different i

> I have no idea how blocking TLDs of entire countries with hundreds of millions of citizens can be considered a valid anti-spam advice. It is very different if you offer it as a service to other people, or if you do it for yourself. If you are doing it for yourself you know if you expect emails from country X or not. And if things change and suddenly you have a pen pal from there you can change your filters easily. So you can live with such simplifying assumptions. If you are providing email services to masses of other people then you can’t make these assumptions of course. You have to use more sophisticated means then.